What term retirement usually denotes to is, to stop working. People often don't like job, so to retire usually tends to be on top of the list. However, if one likes what he does, he will do something similar to pass the time even after retirement.
Now, I'll be honest, I dunno what I am driving at but I wanted to spark topic about retirement. Now, you go,
According to Google, retirement refers to the time of life when one chooses to permanently leave the workforce behind. But if you are still capable to work despite of your old age, then I don't see stopping from work is necessary. You can still work if you want depending on your choice. And if you can manage your own job, then that would be better as you can be your own boss. As long as you're still productive, working will still be possible.
But in the other hand, working at its old age might be very risky already especially that at this age, serious diseases might possibly occur. So you have to be cautious on your health, and just stop working immediately when you think your health is not capable to work anymore.