I know my Dad is young (he was 19 when they had me) and he looks well for his age but everywhere he goes people address him as my dh or dd's Dad.
At ballet last night my Dad picked dd up and the teacher started to ask him about an interview dh did last week. Various teachers at school have addressed him as E's Daddy or said to dd, your Daddy is here.
I guess that there are many people my age who are married to people 20 years older but its ambarrasing when it's my Dad!!!!