With all of our modern conveniences we have gone soft. That's probably what's killing us. The old timers could burn up the fat just from daily living 24/7, while our activity might consist of an hour at the gym. They seemed to be almost immune to the diseases precipitated by excess fat, sugar, carbs and what not
Your personal experience mirrors my own nearly exactly.
The all worked hard going about their daily lives, but none exercised. There was no need! They got plenty of exercise just going about their daily business.
And none ate a diet that anyone would ever consider even remotely healthy.