I feel like we definitely have an older fanbase than most other teams. But that’s mostly because I feel that we lack the enthusiasm or craziness of other fanbases around the league. Might be because of the lack promise shown by the team in recent years but I’m not too sure. Anyways imma say the average is probably around 35+
There is one Colts fan still remaining from the Unitas era who is 146 years old, so that skews the average.