Considering the vast majority of people that walk around naked in the public locker room without an ounce of shame are people over 50 or over 60, I find this comment has got it backwards. There seems to be a universal constant that the older you get, the less you care about what other people think. I know I have experienced this myself, and most older people I ask tend to agree vehemently. It also explains why so many young people are embarrassed by their parents.
My advice to teens and people in their early twenties: don’t worry what other people think of you. No one else is thinking about you much at all.