Some people, some girls say I walk like a little old man.

There may be two situations like a little old man: first, you may be thinner and walk without looking up, so you look like a little old man; The second possibility is that your mental state is slow, such as you are not in a hurry. In fact, it's harmless to say that you look like a little old man, so don't take it to heart. There have been such classmates before, all of whom are outspoken good friends.