Where can we find age-specific training information for each generational group from 40, 50, to 60 years of age?

I know SilverSneakers offer workshops on teaching group exercise to people 65 years old and older.

One of the things that has to be taken into consideration when teaching this group is that many of them have grown up in a world that didn’t participate in structured exercise.

From what I learned on their course the average SilverSneaker participant is 72 years old.