Ye, that is spot on, the Open tournaments I play these days are full of kids from 15 up and very few older players.
Mind you, that sevice speed is taken from a very unusual place, mostly it is taken from the baseline so reads way higher..
5.0 all courter. 2 x Dunlop Bio 400T with cyclone @ 50, 1 x Dunlop Bio F400T gut @ 55
"Tennis isn't easy" - Corners