None of us knows how long we have. My brother died at 37; I'm already nearly 20 years older than he ever was. My mom just celebrated her 90th. She retired at 62 because my dad did. Her comment: "If I'd known I was going to live this long, I wouldn't have retired so young." Live and love every day, that's all you can do. You have a beautiful wife and a beautiful son, and a vocation that makes the world a better place. If you spend the rest of your life worrying about when you're going to die, you'll reduce the value of the time you have.