I am amazed at so many of these first or second time thirtysomething parents, as it was very unusual in the late 70s and 80s where I was brought up!
My granny had my dad at 29, almost 30 in 1955, but probably because she had a career as a nurse until marriage, in the days when women had to give up those sorts of jobs on marriage
My mum was 25 and my dad was 22 with me, the first child, and tbh my mum was quite old really for a first-time mother at the time. Most others wouldn't have been more than 22 or 23 having their first child.
They were 29 and 27 with my brother, the third and last child.