If you haven't seen them in a while expect some "wow you look a bit younger" or "wait, you shaved?" kind of reactions. I mostly got the latter, but not as much as I expected. People see changes but either shut up about it, or mentally ignore them.
For example today (still boy mode at work until the 30th) I ran into a customer of mine that had not seen me in about a year, her official reaction was "wow you lost your beard!" but I noticed her eyeballing me pretty hard to figure me out afterward. No big surprise, my hair is down to my shoulders, my eyebrows have been done, I'm letting girl voice leak through, and I have pierced ears now. But she didn't say anything else, but wow was she staring when she thought I couldn't see her reflection.