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For many people, hitting that milestone can also serve as a great motivator to get their lives together, particularly their financial lives.
There are books, blogs, and Twitter accounts dedicated solely to helping people cross that line. They typically tell you to get rid of debt, stop shopping so much, start investing in 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. You also have to shed the bad habits and illusions that are holding you back.