Happy Birthday, Sandra! See Who Else Looks Fab at 50

They're how old? From Courteney to Lenny, see which stars make beating the clock look amazing

COURTENEY COX

With a physique this fabulous, why not flaunt it? While celebrating her 50th birthday with her new fiancé, rocker Johnny McDaid, the Cougar Town star proudly strutted her bikini body on the beach. "A happy place makes for a fit place," Cox's personal trainer and pal Michelle Lovitt tells PEOPLE of the age-defying star, who also "works out hard, gets regular facials, massages, laser, the whole thing."