The age difference between these two Game of Thrones stars is not at all what you think it would be. Hafþór Júlíus Björnsson plays The Mountain. He was born in 1988. He is currently 25 years old. Thomas Brodiangster plays Jojen Reed. He was born in 1990. He is currently 24 years old. These two people are only a year apart in age. And while we’re at it, this is what Thomas Brodiangster looked like when he was the little kid in Love Actually. Just let that all sink in.