Shy Torque,
When you pass 60, the line
"Class 1 other commercial operations" (date = 6 months hence).
By the way instructing has always been in this category of activity not passenger carrying operations.
If you want to instruct for the CPL after 60 it is a six monthly Class 1 medical, otherwise you drop down to the PPL and the Class 2 privileges which are annual.
Timothy
The CPL licence carries with it all the privileges of a PPL as per FCL 305. see CAP 804 Part D sub part 1 page 1 right in the middle of the box.