I guess I wouldn't overthink it. People are really bad at judging age and everyone ages differently. I get carded all the time, my DH doesn't, we are both mid 40s. I once went to the movie theater in my late 30s with my 2 sisters, 1 is two years younger than me and married with her ring clearly visible and the other is 11 years younger than me, I was asked if I wanted 1 adult and 2 children...and just said yes. I just keep it to the one word answer and move on.