AIBU to consider having a 5th baby at 45?

[Tinkerbellone]

I'm with a lovely guy. He has no children. He's 35 I'm 45. We are financially comfortable.
I have four children. Age 9-18. He's wonderful with the children. (Their dad isn't that bothered).

He says he isn't concerned about having a baby but if it happens he is happy either way. I feel sad he may miss out on raising a child from birth and being a (biological) father.

What would you do? Would you have a 5th baby at 45? In reality what are the risks? Is it selfish of me to even think about another child?

Please be kind. I am looking for opinions.
Thinking about the future.

I didn't expect so many responses. Thank you for taking the time everyone.

I genuinely wanted to hear people's experiences & thoughts on here.
I've been blessed with four lovely children; I adore being a mum and my job is working with children.
I have a very physical hobby and I am enjoying greater independence now that my youngest is nearly 10.
I can't imagine pausing all that again, combined with the worry of a poorly baby.
Really appreciate your responses.
The 'womb' comment was tongue in cheek- apologies if it caused offence xx

I know 2 people who had babies in their mid 40's. Both were born extremely premature, and had a myriad of problems when small. Luckily no long term disabilities so now they're OK (10 years on)

I know a couple of women who had their first children at 45 with some assistance, but a first child with a partner who wanted it as much as they did is a very different situation to this one, I think.

I had my last child at 41 and as she gets older so do I ;) I wouldn’t advise anyone to have a baby beyond forty unless it was their only child.

YABU.

You already have 4. Prioritise those rather than having a fifth for the sake of it.

Dont do it!!!

Just thought I would add from my view point OP. My mum had me when she was 45. In many ways it was a positive my parents were doing well by that age financially and both very fit/active. I never felt like they looked much older than other parents either. Now, however, it does get to me. I am 32 my mum 78. Despite how fit she was age has crept up on her suddenly and I can really see it now. I do feel sad/worried that I might not have as much time with her. A friend of mine mum recently celebrated her 50th I was abit shocked at the age difference between her mum and mine.
I guess because of this I always said I wanted my children late 20's/early 30s which fortunately I have done.

@username30593 OP does have 4 kids already it’s not really necessary to go on and have a 5th. If it’s your only chance to have a child at 45 I may have considered it myself this is not OPs case.

Imagine starting the primary school run at 50. You'll be nearly 60 when you're free of that shit