You are young strong and have no health issues at this time. Accept that as a gift from the powers that be and stop bragging about it. Just because you don't even take aspirin doesn't mean that poor health won't eventually catch up with you.
So take care of those that you say you love now. Because if and when the time comes they will be the ones you will depend on to look after you. As I have often heard – 'be good to those that hold the ladder that you climb toward success so that they can willingly catch you should you fall'.
Your older wiser self, Allan.