huh? Isn't that a compliment? Eyebrow hair, like head hair is generally wanted to be enough rather than only having it in limited amount! So, if you have plenty of hair then you can do whatever you want with it rather than not have the option. For example, it's like saying "usually men's hair gets thinner as they get older, we see a few older men here" if it were a hair salon and the person is talking to someone with a very full head of hair. It's meant to express a compliment that they're surprised (and impressed) that you are resisting usual signs of aging. Now, if you think being grouped into "older women" here is insulting, then that's very much a personal issue because a 35 year old is considered an "older person" in society, it's not an insult, it's just a fact. I'm in my early 30s, I'm an older person. It's not unusual to have personal sensitivity towards someone mentioning you're not young anymore, but it's unfair to reflect a personal insecurity back on a person who just said something factual and has no reason to mean something by it (why would she be calling you "old" in a derogatory way? You're her customer at this time, she wants to have repeat business and people generally aren't out to insult other people, why would they?). She assumed you were comfortable in your age that's all, it wasn't an insult, it sounds like they meant the exact opposite actually, they were being complimentary.