Older you get I think the more you realize many go before you, many with big "C" too, and there is nothing we can do about it.
Work more, sounds like you balanced it all out OK! At 20 you still baulk the system, questioning, stubborn or hard headed to really know what you want, so keep fishing, riding and loving that you can do into old age.
Sorry to hear about your sister, cannot believe my oldest brother hit the road three years ago already!