A Senior Moment?

When I was paying at the cash register at my local Shoppers Drug Mart on Princess Street today, the cashier totalled up my purchases and then said, "and you get the Senior's discount". Whoa! For the record, I'm 55, I'm of normal weight, and I was wearing some nice "Cut Loose" clothes with cute black lace-up boots and my Lucy scarf. OK, I don't dye my hair, but the grey streaks in it have been admired by some who thought it was the result of art, not nature. I really don't think I look like a senior--not yet. Or do I?