Everyone in our families have lived to advanced ages, and, I agree, even if not “hard labor,” keeping physically active everyday probably has had something to do with it.
Of course, you also have to look at genetics, habits, mental attitude, and other things to know why some human beings last for a very long time and others don’t. In the end–no one lasts forever–so, imo, it’s good to try to make the most out of each day–and that means something different to everyone.