I adopted my children so slightly different, but I was 40 when I had my first, she was four months, and 41 when number 2 came along, also a baby.
I think I'm a much better parent being that bit older, I'm certainly a lot more patient than I would have been even 10 years ago. However, I think physically, I'd have coped better being slightly younger having them. I really feel the lack of sleep and (time to) exercise at the moment whilst they're so young, (3 & 4 now). I'm hoping in the next 12 months or so, they will sleep a little bit later than 5:30, so I can get up then and have an hour to myself to exercise before the house wakes up!
My mum was 28 when she had me, I am the youngest of 4, she was 21 when she had my eldest sister. I recall her being a really shouty mum as we grew up, however it was the 70's/80's and I think a lot of people were back then.
We are now close and ( I now realise) incredibly similar, in different circumstances I think I'd have also been a shouty parent.