Justin Hartley has been in the spotlight for quite some time [1], but he hasn't aged a day [2]. In fact, if you put one of his scenes from Smallville (where he played superhero Green Arrow) next to one of his more recent scenes from This Is Us [3] (where he plays Kevin), it would probably be almost impossible to tell the difference, apart from those frosted tips, of course. Despite playing a 36-year-old on the hit NBC series, the actor is 40 years old in real life. Yes, really. He's the third oldest in the cast [4], right behind 60-year-old Ron Cephas Jones (William) and his onscreen brother Sterling K. Brown (Randall), who is 41. So he's either aging backward or he's found the fountain of youth [5].