74.3 [...] I think I got penalised for not visiting the doctor often enough

I don't think that's it -- I treat my doctor on a strictly don't-call-me-I'll-call-you basis (in fact, I think as far as they know my address is still my university address from 1990) but still scored well into the 80s.

As an aside, it only occurred to me after a conversation with some Americans about the Queen Mother that the expression "to have had a good innings" only makes any sense at all in cricket-playing countries, where 80, 90 or 100 really is a good innings. It makes no sense at all to a follower of baseball...

Peter