heather locklear, at 51. >> nobody moves that more than heather locklear. >> reporter: some of hollywood's lo, demi moore, and naomi campbell move that age is just a number. >> after two kids, you don't look so bad. i'll do it. i'll rock the bikini on the beach. >> reporter: this is like hi, i'm grandma. we stopped by canyon beachwear, to find out how real women of a certain age can feel comfortable rocking a bikini. >> it's not an age. it's a comfort and how good you feel about the suits. >> reporter: when is the time to give up the bikini? >> when she doesn't feel it's the right fit. >> reporter: here are a few other potential deal-breakers. stretch marks, saggy skin. is it a work function? or there kids around? luckily, there are a few tricks that allow you to cover problem areas and allow you to feel sexy. >> this is a monkini. >> reporter: try a tankini. and a lot of people have that as a problem. the skirt. you have a sexier stop, but the bottom is more covered up. >> reporter: for "good morning america," juju chang, abc news, new york. >> i'm going to have a mumu on. >> i was learni