Age is relative

I have been thinking about when i will actually retire totally ( i have retired from the government service 10 years ago ) from giving private tuition. A few years back, i was thinking whether i would call it a day at 60 and now i am already 6 months into my 60th year of my life and i am still enjoying my teaching life besides the extra income i earn from it. I am not actually thinking of giving up of what i am doing now but sometimes i wonder when i should stop working completely. Then when Manchester United won the EPL trophy for the 18th time last weekend, i started reading all news on them in all the main English newspaper on their websites. Inevitably the time for their manager, Sir Alex Ferguson, to retire became the topic of discussion again. And he has not shown that he would do that in the near future. That sort of enlightened me on my own situation though there is hardly any comparison of what i do with the great Scot. If i am still enjoying what i am doing then i should just go on.