Would you find this relationship ok. Age difference

Not at all - this is normal.

That's the ages of me and DH when we got together , 18 years later happily married with a ds10. People did think it a big age gap when we first got together though.

Between consenting adults, age gaps are of no concern in my opinion.

In my early-to-mid 20s, I had relationships with people my own age right up to 20+ years older than me. Each had their own merits and worked for the duration we wanted.

I don't see the problem. Assuming both parties are happy, then it's fine.

I was going to say similar.
I know of a situation where the guy is one or two years younger than the woman, still lived with family, and basically lives now between her place and the other place, had a child together since, plus two of his own from a previous relationship whom he used to cram in to one room at his other place and obviously had no plans to do otherwise and held out. As the gf was waiting for permanent housing, and when she got it he asked if he could use her place to have his kids for his contact time, so although I think yes, if you are to be serious you have to, to an extent take on one another's lives, as she has a child from previous too, but so yeah lol that is where he has his kids when he sees them, all crammed in to one small room with her eldest lol.

Mind you there are older men who are just as bad.

It’s okay, yes. But if looking for this to be a long-term thing you obviously need to be on the same page. A 31yo woman may be more inclined for marriage and children very soon, whilst a 24yo may not be at that stage yet. But if you’re both wanting the same thing it’s absolutely fine.

I don't think it's inappropriate but I can't imagine wanting to date a 24 year old in my thirties.

Are you serious, that’s no age difference??

Certainly unusual and it is definitely reasonable to be wary (I am 31 and can’t think of anything I would have in common with a 24yo) HOWEVER my SIL was 32 and my brother 24 when they met. We all found it a bit odd and assumed it would fizzle out but went along with it anyway…and they’ve been married for 6 years!

Yes, of course.

How can anyone judge this based on 2 numbers without knowing their personalities. Are they similar stages in their life? Similar level of maturity?

Depends on the people I guess. DSS is 25 and lives at home with us. He's very immature. Has no idea of how to run a home, how real life finances work, organise bills, clean a house, cook, food shop etc. He comes home from work and plays and shouts on his PC with mates all night. I can't imagine a 31 year old woman being attracted to that.
Obviously not all 20 somethings are like that so depends on the person.

Your brain is only fully developed at 25. That is fact. I am under 25 so if anything I am slighting myself here. There are so many people out there I don’t know why most folks can’t find someone they connect enough with that is somewhat close to their own age.

God forbid anyone be " unusual " 🙄

Ridiculous narrow minded attitude

I think that kind of age gap is absolutely fine at those ages.

NC as specifics could identify me along with posts on usual username.
I'm mid-thirties and my partner and I have a bigger age gap than the one in the OP (I'm older). We have 2 kids, now living in the second house we have bought together. Also had a couple of "nothing wrong with it but you know it won't last" comments at first.
My ex before him was a year older than me, and the most horrible man-baby I have ever had the displeasure of knowing. Abusive, regular tantrums (and yes, I mean lying on the floor kicking and screaming) and incapable of looking after himself properly.
I've definitely learned that age (assuming all legal of course), is not the deciding factor.

Is it OK, yes. Will it last, possibly not.

It’s not too bad but I think the 20s is an age where you are still discovering who you are, under 25 the prefrontal cortex hasn’t wired up yet so I still consider that young adult. Easy to judge looking in though op.

I wouldn’t say I don’t think it is ok, as in it isn’t something that I would raise eyebrows at. But I think there is potential for problems in life plans not being aligned.

There will be exceptions, but I think at 24, men and women are in quite different levels of maturity.

I think a 24m is at the same maturity as a 20-21f. And a 31f is more like a 34m. So the difference in maturity is far greater than the physical age difference. Essentially he's at the place she was nearly a decade ago.

When I was 28, I dated a 41yr old and we were very compatible, you didn't notice the age diff at all. I am now 41 and to reverse it, the idea of a 28y old man as a partner would be inconceivable. We'd have nothing in common. I look at how he behaved and would cringe at me behaving like that now. It helped that he looked young and not like a sore thumb in a late twenties crowd, but I would absolutely have no interest in doing the things now, that I was doing at 28.

Is it OK? Yes.
I'd probably raise my eyebrows, but more out of surprise than in a judgey way.

Why do you care if other people think it's ok or not? If a bunch of randoms off the internet tell you they think it's not ok, would you end it? Do you, no-one else matters

Things that I would consider if in the same situation.

1. Where are you both career wise
2. Disposable income.
3. Who lives where - housing situation.
4. Shared interests, life experiences.
5. Where the relationship might go long-term, who wants what from it , possible children etc.

At that age I'd have never have gone for someone so much younger, it feels like it's more obvious at that age.

Perfectly fine. Notwithstanding any other issues