My kids both play football, they are 9 and 11. Last year, a boy who also played for the same team but was in a higher age group, got a concussion. I don't think it was a bad concussion (as far as they go), but he was out of action for a good 3 weeks (doctors orders) which meant he missed half of the season. I appreciate that there are varying degrees of seriousness to concussions, and I'm not a medical expert, but I think all concussions should be treated seriously. That way, there is always hope that you can play again next season.