Can I ask something?
Recently, I've found that if I am placed within a group of people, with ages ranging from my own age (16) to about 60ish, I am automatically drawn towards the older people in the group, those who are over 40. (I'm not saying that people who are over 40 are old, but that they are
older than me

). They're just much more respectful, open-minded and welcoming than my generation, but does this make me 'odd'?
(Incidentally, I've found it to be similar on this forum. Whilst I am more than happy to, and like to, talk to people my own age, often I find myself communicating more with those of you who are a generation above mine.)
So, in my case, you know you're getting old when you can relate to what 'older' people are saying, more than you can relate to what your own age group are talking about.