I don't really FEEL slower at 40 than I felt at 25, but wheras I used to be able to retrieve every lob, I'm always a step late now.
I'm still good at getting to short balls, the problem is when I have to stop short or change direction, I always feel a few more reps away from blowing an achilles, hamstring, or knee. Last night in my league match I felt a grinding sensation in my knee that I have never experienced in my life. It was pretty scary.
3.5 player. Equipment: Prince Original Graphite OS, Tourna Big Hitter Blue