I am very aware of that, and more so than you understand. Before I was treated for being bipolar, I was drinking alcohol at the age of 12 and abusing alcohol at the age of 14. Still being alive at the age of 29, I will say I have a 40% chance to be alive to be 50. Being alive to be 80, is really slim to none. I have been a rationalist, not a idealist all my life. Very few people when they get into their early 20's debate with themselves, with education, with health, with the location they live at, and other minor factors -- what is the rational lifespan I should have. When I did this thought experiment, I came to understand that my lifespan is going to be shorter than average. When anyone accepts they are going to have a shorter lifespan than average, they do become more reckless with their lifestyle.