Have had long hair since my late teens, still do the ponytail, though past 10 years it has lost its thickness, and has never grown all the way to my shoulders since some crazy woman cut it off in 2001 and I have never once had my hair cut since.

I've got a pony tail, I let it down from time to time, I'm looking forward to going grey, I'm going to do my best to look like a wizard. A 100% bias opinion but if long hair is for you just do it, it looks good feels good and doesn't do any harm. I was 15 when I decided it was for me and haven't looked back.