My dad is old.This is more when I was in elementary... my dad had me when he was in his fourties. So I used to tell people that was my grandpa.
I'm sure there's more...what are some of yours?
I understand where you're coming from XD My mom had me when she was in her early-mid forties and my dad in his late forties. But I wasn't really embarrassed since many of the kids around me at the time also had parents who was around the age of my parents as well

Growing up, my first name was what embarrassed me most. I went by my middle name and that's what people called me but when people saw my first name they'd start teasing me because they thought it was funny. Now I'm just annoyed when people tease me of my name or call me by my first name just to tease me. I mean, if they were calling me by my first name our of sincerity I wouldn't mind