check list for life?

As I'm getting ready (or not) to leave my twenties behind in a couple of years, a dark cloud seems to be forming over me. Every time I think about the things I want to do/try/accomplish during my lifetime, the cloud just gets bigger and darker, a constant reminder of the little time I have left on this planet (well, in the grand scale of things anyway). And it doesn't help that I have a tendency to procrastinate. So A and I have been talking about making check lists of everything we want to do in this lifetime. We would then take check points every few months or years and revise as necessary. Good strategy? Dont know. But it's a start.