No. How is that being YOURSELF all about, if you let others tell you when you SHOULD or should NOT about YOUR hair?
"Many women in my family insist that I need to cut my hair because I'm "too old" to have long hair and I should have a sensible "grown up" cut ." They haven't been around to see that many MIDDLE-AGED women, even women in the nursing homes can have long hair too! Good search their photos in the gallery.
My advice for you: Don't give in to peer pressures, specially relatives who bring you down! Negative influence, stay away from them! They're jealous of you, and their goals are to bring you down to their level, I call that BULLIES in my universe! This is not 1960.
Photo below taken from a retirement home, she does her own hair, she's about 92 years old.