Well, you have played recently near the 4.5-5 levels. I have'nt been there in 27 years....
And in singles, as PowerPlayer mentioned, I'd be bagelled by u guys, with my "superior" movement and speed.
One of the old fart I play with, a 67 year old, who beat me bagels last year (one of my peers in doubles, except I haven't lost to him in doubles yet, out of 6 sets now), says a senior, no matter what level he WAS, cannot be a real 4.5, just due to slowness.
I know there's that recent example of a 63 year beating a partying Div1 player in a match, but that would never happen again.