One of the incentives of practicing orthodox martial arts is the health benefits. Is this why almost every martial artist, if undisturbed, can live to 80-100 years? What's more amazing is that people at age 90+ can still fight like a pro. I mean, is there any great martial artist in wuxia who died of cancer, heart problems, lukemia, parkinson's disease, flu, or infections? In reality, probably the average life expectancy back then was 30-40 years at most. The only example of deterioating health at a moderate age that I can think of is Bei Haishi from Ode to Gallantry. I can't recall why he's having problems though.