I don't feel exactly "older", I am 55, but as I remember my teen years that didn't seem too young! I am disabled, and I have experienced a number of young people being willing to help me - whether it is to open a door or help to carry packages. Some of them are in hugely baggy pants, nearly bald heads, and tatoos; looks usually identified with gangs.
The difference is, I think, that I look at them and say "hello", with no judgement, an openness to being accepting of them as they are. They, in turn, see me as I am - needing help - and more than not - give that help with an attitude of respect. I believe they feel they were given respect, and return what was given to them.