I have 3 boys - the first I was 21, DS2 I was 23 and DS3 I was 25.
I plan to have another one when I'm around 28, and another when I'm 30 if I can convince DP. Then hopefully I'll be done.
Interestingly, my mum had two daughters in her 20s, myself when she was 24 and then my sis when she was 26. She then had my brother when she was 32. I think you are supposed to be more likely to have a girl if you start a family later in life, but I know quite a few folk that have boys and are in their 40s.
Love my babies