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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

Not to have known his true age before sleeping together?

487 replies

Lockingthegins · 20/12/2025 22:03

He’s bloody 18! Not 19 until April

Casual conversation and flirting lead to hotel room and sex.

Really mortified to discover he is actually 18. No, he didn’t actually tell me. I assumed he was about 21. I am 28.

I feel so, so awful. Really panicked when I found out the morning after. He doesn’t seem bothered and thinks it’s all fine. Grinning like a Cheshire ca

Good lord, I haven’t scarred him for life, have I? Please someone assure me I’m not sick in the head

I would be furious if I was his mum!

OP posts:
brightnails · 21/12/2025 10:06

an 18 yo and a 21 yo look very different. It’s not hard to tell. when my eldest’s friends are here you can even tell who’s 6 months older. they’re still growing kids physically and mentally tho not legally which was what you were interested in. their manner is also clearly very young compared to a 28 year old, I don’t know how the flirting took off. I felt in a completely different chapter to a 21yo when I was 28 and wouldn’t have gone near. can’t think why you did 😳

Zov · 21/12/2025 10:09

DahlsChickenz · 21/12/2025 00:07

I doubt he's scarred for life but it is weird for 28 year olds to sleep with teenagers. Even if he was 19 it would still be weird. He's of the age of consent so you aren't in legal difficulty, but don't teens seem very young to you? When I was 28, sex with a 19 (or actually 18) year old would have felt predatory and deeply unappealing.

Exactly this. ^

Rosscameasdoody · 21/12/2025 10:09

ilovepixie · 20/12/2025 22:19

If it was a 28 year old man sleeping with an 18 year old girl would the responses be the same?

Why the assumption that an 18 year old girl can’t consent to sex ? If it’s consensual and theyre both adults what’s the problem ?

MummyJ36 · 21/12/2025 10:10

I mean he’s legally an adult and seemed to be a very willing participant so I wouldn’t dwell on it if I were you.

Zov · 21/12/2025 10:10

MannersAreAll · 20/12/2025 23:48

And I still don't believe there are "loads" of men who, due to being in a similar situation to the Op and encountering underage girls, have ended up in prison.

Not a chance.

Maybe "loads" of criminals convicted of sex crimes who claim that is what happened to poor, innocent them, but you'd hope an experienced prison officer would know the difference...

This also... ^

Busyasabumblebee · 21/12/2025 10:12

Ratioed · 20/12/2025 22:05

Ick.

Why didn’t you ask? And look for proof?

What age are you?

Edited

I always look for proof of age of every man I sleep with. ‘No documentation, no shag’ is a policy that might seem excessive but it works. I recommend it

Justchilling07 · 21/12/2025 10:16

Biskieboo · 21/12/2025 09:09

Two Adults In Having-Fully-Consensual-Sex-And-Enjoyjng-It Shocka!!!!

Seriously outside of the usual internet pearl-clutchers nobody will care, other than to maybe have a bit of a giggle.

Pearl clutchers🤣

spirit20 · 21/12/2025 10:17

I think it's a bit strange that you wanted to have sex with someone so young. He might think it's funny now, but when he's that age himself, he might look at it differently.

aperollingintotheweekend · 21/12/2025 10:20

Ewwww

LasVegass · 21/12/2025 10:22

Who paid for the hotel?

Did you tell him your age beforehand? I’m watching Younger on Netflix, has a 40yo woman pretending to be 26 storyline. She hasn’t told her boyfriend her real age yet.

Justchilling07 · 21/12/2025 10:25

spirit20 · 21/12/2025 10:17

I think it's a bit strange that you wanted to have sex with someone so young. He might think it's funny now, but when he's that age himself, he might look at it differently.

oh poor him, he’s going to be traumatised🙄

Aluna · 21/12/2025 10:26

I’m not sure why you’d want to shag a 21 yr old, but if you do this kind of error goes with the territory.

Liondoesntsleepatnight · 21/12/2025 10:26

If it helps you feel better I accidentally shagged an 18 year old, really great guy, I thought that he was at Uni but he was in 6th form, only realised when I deduced he was actually in my Dad’s class (my Dad is a teacher) I realised that he was barely legal to drink! I was 32

Zov · 21/12/2025 10:26

Dontlletmedownbruce · 21/12/2025 00:00

I don't think its a big deal OP and I don't understand why people get so bothered about age gaps, whichever way it goes. What really annoys me is the constant assumption young women are too stupid to know their own minds and make their own decisions. The laws are there to protect vulnerable teens from predators. Most women are not vulnerable and are well able to manage themselves, yet we constantly undermine them.

Many females (and males) are vulnerable and not able to make rational decisions when they're under 21. It's ludicrous to suggest otherwise, and that as soon as someone hits 18, they're a fully-fledged grown adult with a whole world of wisdom and knowledge. (Like some people come out with)

They are often academically bright, with a faster and sharper brain than say, over 45s, but they're still young, and know very little about most things. Most brains don't develop emotionally and mentally til they're over 25. Have you never seen an episode of The Chase? Most under 25s on there are terrible. They have such a lack of general knowledge. They're not thick, I'm not saying that, they just haven't ammassed a lot of knowledge at that point, only academic knowledge, and knowledge around their hobbies and interests, like gaming or music or sport or whatever...

From HIH. (National Institute of Health.)

The adult brain doesn't fully mature until the mid-to-late 20s, often cited around age 25, with the prefrontal cortex—responsible for judgment, planning, and complex decision-making—being the last area to finish developing. This process involves significant rewiring, pruning excess neural connections, and strengthening white matter, allowing for better integration between brain regions, a process that continues well into adulthood,

So anyone saying 'meh, it's perfectly OK for a 17-18 year old to be with someone of around 30, 'because they're both adults... or both 'legal' Just stop! They are at completely different stages in their life. Why on earth someone around 30 wants to be with someone 10-13 years younger just baffles me!

Zov · 21/12/2025 10:28

Mothership4two · 21/12/2025 06:28

I 'm not sure all teenage men want older women! But I remember watching a documentary years ago about the English debutante season and laughing when the young posh men who had been rounded up to socialise with them - the deb's delights - were all saying that they fancied the mums rather than the daughters!

The young men and women were around 17/18.

You mean the 'teenagers.' They are not men and women at 17-18.

UneAnneeSansLumiere · 21/12/2025 10:28

RollyPollyBatFace · 20/12/2025 22:21

Well as the mother of a 19 year old son, yeah, I’d be unimpressed with you that’s for sure

having said that, I’m not likely to know so meh

but next time - check? It’s only by luck he wasn’t 17. And are you really telling me you couldn’t tell he was 18?!

I don't approve of the OP's behaviour at all, don't get me wrong, and I also think that if the genders were reversed the answers on here would be very different. However, I thought the AOC in the UK was 16, not 18?

Aluna · 21/12/2025 10:30

Rosscameasdoody · 21/12/2025 10:09

Why the assumption that an 18 year old girl can’t consent to sex ? If it’s consensual and theyre both adults what’s the problem ?

The issue is that OP didn’t ask his age. (And also why on earth she’d want to sleep with someone that young in the first place). She might be 18 she might be 15…

notacooldad · 21/12/2025 10:35

Go and watch Harold and Maud- it’s a great film and will put things in context
What a fabulous film.
I fancy watching it again! Such fun.

FerrisWheelsandLilacs · 21/12/2025 10:36

Makemeanonymous · 20/12/2025 22:17

And you are equally approving of a 28 year old guy having a ons with an 18 year old woman?

Would he be a a " happy memory" to her dying day?

Well at 19 I slept with a 27 year old man. Slightly narrower age gap, but it will be a happy memory until my dying day.

I did go on to marry him though…

ACR7 · 21/12/2025 10:36

At 18 I had a dalliance with a man in his late 20s. He was bloody gorgeous and I had a wonderful time. I haven’t thought about that in a while but it’s a fond memory. There’s a difference between predatory behaviour and young consenting adults having abit of fun.

sunshinestar1986 · 21/12/2025 10:36

Needmorelego · 20/12/2025 22:40

An almost 19 year old "18 year old boy" isn't a boy.
He is an adult.

When I was in college I saw 16 year olds that looked like 12 year olds and 16 year olds that looked like they were in their 20s
Not everyone's the same.

Jamesblonde2 · 21/12/2025 10:38

You must have been pissed. I don’t believe he didn’t look or act his age without your beer goggles on. Grim.

Blades2 · 21/12/2025 10:39

Grim.

At 28 I wouldn’t have looked at a 19 year old let alone slept with him.

Ick ick ick.

x2boys · 21/12/2025 10:39

Zov · 21/12/2025 10:26

Many females (and males) are vulnerable and not able to make rational decisions when they're under 21. It's ludicrous to suggest otherwise, and that as soon as someone hits 18, they're a fully-fledged grown adult with a whole world of wisdom and knowledge. (Like some people come out with)

They are often academically bright, with a faster and sharper brain than say, over 45s, but they're still young, and know very little about most things. Most brains don't develop emotionally and mentally til they're over 25. Have you never seen an episode of The Chase? Most under 25s on there are terrible. They have such a lack of general knowledge. They're not thick, I'm not saying that, they just haven't ammassed a lot of knowledge at that point, only academic knowledge, and knowledge around their hobbies and interests, like gaming or music or sport or whatever...

From HIH. (National Institute of Health.)

The adult brain doesn't fully mature until the mid-to-late 20s, often cited around age 25, with the prefrontal cortex—responsible for judgment, planning, and complex decision-making—being the last area to finish developing. This process involves significant rewiring, pruning excess neural connections, and strengthening white matter, allowing for better integration between brain regions, a process that continues well into adulthood,

So anyone saying 'meh, it's perfectly OK for a 17-18 year old to be with someone of around 30, 'because they're both adults... or both 'legal' Just stop! They are at completely different stages in their life. Why on earth someone around 30 wants to be with someone 10-13 years younger just baffles me!

Well first of all hes 18 nearly 19 not 17 and Op is 28 not around 30 and secondly it sounds like a one night stand, not a relationship.

x2boys · 21/12/2025 10:42

Zov · 21/12/2025 10:28

You mean the 'teenagers.' They are not men and women at 17-18.

Wether you like it or not an 18 year old is legally an adult.