Comment by dombesz

My granddad was a teacher through his life, going ~20km every day by bike for 40 years, in rain and even in the winter. When he became retired, he started physical work of farming crops, making hay for his cows for the winter. He lived for 92 years, while he was still able to walk around and take care of himself on the basic level. He got also a type 2 diabetes around his 80's, but wasn't prescribed metformin. I strongly believe the physical work in his retirement gave him the strength to be in a good shape in his late years.