What’s the big age difference snd why is one sport less likely to feature older?

So I was just thinking in the nba when you get into your 30s you’re seen as older and you may not be a focal point on a team they could be a complimentary piece or role player. Now with the nfl that’s a full physical contact sport you have guys that age and above

What’s the big age difference snd why is one sport less likely to feature older?
Post Opinion