Whereas the middle aged folks these days are far superior to the ones that were around when I was a kid. Back then, people in their 40s were grumpy, opinionated and thought they were always right. But now that I'm in my 40s, I am a completely reasonable, level-headed person.
Actually, since I turned 50, I've noticed a big decline in the quality people in their 40s.
Lie about your age. I know how old you are (and you know how old I am). I tell people I'm 10 years older. It's very gratifying the comments I get, so "with it", fit, healthy and youthful.
OTOH my standard reply to checkout operators when they ask me "did you find everything you needed" is to reply "I don't know - I've probably forgotten something - do you know what it could be?".