Probably pretty similar to the political makeup of this forum.
Given that many are under 18, and even those of age skew younger than the general population, I think it's fair to say a clear majority don't vote.
Maybe like 20 years ago.
Presidential results, which are the biggest deal elections, are usually in the 50%-60% for turnout. Even there the numbers skew older. While there are plenty of people in their 20s and 30s who play games, there are not many 50+ gamers relative to their population. There is no way a majority of gamers vote, and certainly nothing like this forum, where people are
obsessed with politics and vote every chance they get.