I have checked Bustimes for the fleet today and although not a lot of very new buses I don't think is a bad mix.
13 06 plates
2 07
11 57
4 60
18 11
6 12
1 62
1 13
23 63
1 14
6 64
25 65
2 16
2 66
13 17
15 18
1 19
12 69
28 20
42 70
2 71
2 22
5 25
Not a bad mix I would have thought...