My tinsmith workaholic grandfather had his first heart attack in his mid 50's and I've been watching him lose metaphorical and sometimes literal pieces of himse

My tinsmith workaholic grandfather had his first heart attack in his mid 50's and I've been watching him lose metaphorical and sometimes literal pieces of himself due to his poor cardiovascular health for the last 30-ish years. So does this mean that the two anecdotes balance out, or that it's possible we shouldn't consider single cases as data?