This is Steve Buscemi. He is 54, the perfect age to play Beetee who is between the ages of 50 and 60. You may remember him from "The Island" or his voice in "Monsters Inc".
Beetee is a past victor from district 3. He won by creating a electronic trap which killed the remaining tributes.
In the Quarter Quell , he is paired with a woman called Wiress. She was later killed by Gloss at the Cornucopia. His favorite weapon is some special coil/wire. In Catching fire he designs an electric trap that helps them escape the arena. He is very smart and is able to break into the Capitols computer system in Mockingjay.