Annoying questions re non-sibling triplets

Why do you ask is always my go to answer when I think people are being extra nosey. I say it with a smile, and most of the time, people have no answer for me. I get asked often if my 2 oldest are twins, and sometimes they say yes (they are so not twins) and sometimes I just smile and say "No, they're just close in age" and leave it at that.