They really could with how much someone's identity could change, and dose change. It's a part of life. People change religion, politics, sexuality, all of that and even smaller things too like food prefrance. All of these make up the identity that people think of when they think of you, or that you think of when thinking about yourself.
Sometimes you figure out things that won't change. Like I did when I discovered I was a lesbian. That's not going to change anytime soon. At all really. But other parts I can see changing. I can see me finding out I'm really just a monogamous lesbian. No swinger. No bi romatisium.
And I'm okay with that. It's part of being human is wiggling around, finding out who you are and then learning to love your self and let your self be loved so that you can love other's to the fullest in return.
As for know, this is what I'm pretty sure I am and can see me being for the rest of my life. Swinger and all that jazz.