Originally Posted by Maui19
I'm a dude. Big difference on the men's side in my area IMO. Adult 4.0 is much more athletic and fast paced. Senior 4.0, not so much.
In doubles I would say there is not that much of a difference. A lot of the best dubs players were 40+ in the prior system. In singles there is a big drop off from adult to 40+.