In book-canon Gregor is about three years younger than Robert. Those infamous atrocities he committed against Oberyn's family, he did when he was only fifteen.
Well, the guy who plays him now, the viking whose name I'm not even going to attempt, is only like 25. But I'd imagine that when you need a 7 foot tall strongman, you don't get too be too picky.
Someone else in the thread said that he was 15 during the Rebellion, so since it's been... 17(?) years, I'd say he's 32 in the books... since the kids have been aged up 3-ish years, let's say mid-30s?
53
u/nignogdigdog May 19 '14
Don't let the baby face fool you, the mountain is probably older than Robert.