There are books, blogs and Twitter accounts dedicated solely to helping people cross that line in the best shape for their future. They do this by telling you to get rid of debt, stop shopping so much, start a 401(k) and brace yourself for wrinkles.
But in my opinion, it takes a lot more than a healthy bank account and nice skin to live a full and happy life, whether you're 29 or 59. Most of us know how to succeed, we just happen to let ourselves –– and a few convenient lies –– get in the way.