76 in the first Hunger Games film, according to Donald Sutherland
In 2012, around the time that the first film was released, Donald Sutherland was quoted in an interview as saying:
And those scenes aren't in the book. He wrote them and Suzanne Collins loved them. But it so perfectly described what someone — an administrator, a bureaucrat, not even a leader — that Coriolanus Snow is and that he has to do. How do you keep that underclass in control? You offer them a little bit of hope. He thinks that Wes Bentley's character would probably take over his position. He [President Snow] is 76 years old, he was two years old when the Hunger Games started. And he's looking for a successor. And he tests Wes' character. "You've allowed this girl, this underdog. Do you like underdogs? You've allowed her to take some kind of position of power"... When you fail, you die...
Like somebody else said , Snow would be 82 during the 74th hunger games. I just wanted to put some math behind this. Based on what we know about the book so far Coriolanus Snow is 18 during the 10th hunger games, 74 - 10 = 64.
64 + 18 = 82.So As of the 74th games Coriolanus Snow would be 82.
(74-10 gets you the distance between the two games)
(64+18 Adds his age during the 10th games to the years separating the 10th and 74th games)
In The Ballad of Songbirds and Snakes, page 4, it says he was 5 the first year of the war, and then it says "...the remaining two years of the war." So he'd be at least 7 when the war ended. On the next page it says the rebels had been silent for a decade (plus it's the 10th hunger games) so he's at least 17 for the tenth hunger games, so at least 82 in Mockingjay