I would not think anything of it. I am 26 and successful and I have been asked the same question when I am at retail stores because I look young. I just politely say "No, I'm sorry but I don't." I dont get offended. I often laugh because I'm never wearing anything that would resemble a uniform 


IMHO, it's more the idea that this woman possibly assumed a black woman at such a hoity-toity place surely had to be the housekeeper.