I used to play basketball almost every week at the university gym. There were these guys in their 60's who still played with 19-25 year olds and routinely won. I asked one of them if he saw one particular thing young people tended to ignore. He said, without hesitation, "the team game."

There is probably some bias, the young guys probably didn't play quite as hard as they would have otherwise, but I'm really not convinced that accounts for the entire story.

Maybe it's just as simple as: interaction effects on teams are often stronger than main effects.