I'm 50. Amazing isn't it. I think that being a hippie is a state of mind. It doesn't matter how old you are. If you feel hip and can dig what is being laid down then you are welcome. Heck even if you can't you are welcome too.
I agree it's a state of mind. It's not all about smoking weed, growing long hair and listening to the Grateful Dead, though all of those are fun in their own way. It's about a certain way of being easy going, not getting hung up on assumptions and trying to be good to each other. Good vibrations!
I'm growing my hair, but it's not due to my "hipness." I just don't want to risk getting covid-19 at the hair salon.