I'll be 49 and just turned 52 seems quite old when I write it down! My mum was a Gran at 44, so young! She had her first at 21 and my sister had her first at 23.
My mum had me at 23, dad was 24 and I don't remember thinking they were really young parents. I realise now they were. What I did notice is when one of my friends mums was so much older. I think she had her closer to 40 but most of my friends parents had their kids early to mid twenties.