Rob Lowe turns 51 this week! That number makes sense given that he's been looking sexy in the spotlight since the '80s, married to his wife, Sheryl, for almost 25 years, and has two grown children, but it's downright confusing when you see his handsome face. He's one of many celebrities who seem to have found the fountain of youth, and we're here to remind you of that important fact. But let's not forget that he's been turning heads for years, and some of his younger looks are also some of his best. Start scrolling to revisit Rob's hotness both then and now — and happy birthday, Rob!