I think about this often too. Especially after spending time with my 90 year old grandma, she's lived so long and often talks about dying / being prepared for it. It's hard, but makes me think about what the point of anything is. It's good to know I'm not alone.

One thing she told me once at a birthday party where I wasn't eating the cake because I was on a diet was, "Life is too short not to eat the cake." It's along the same line as Skeezyks shared - do what you love and enjoy it.