I often teach that Buddhism is about how to be truly happy, so I have been studying the new research field of "happiness studies," which focuses on the objective measures and causes of happiness. Researchers have found three factors that reliably increase happiness as we grow older -- gratitude, generosity and reframing (seeing your situation from a more positive perspective). Not surprisingly, the Buddhist tradition offers these same three factors as spiritual practices for cultivating happiness. I would add two more -- curiosity and flexibility.
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And from The Urantia Book;
156:5.18 As you grow older in years and more experienced in the affairs of the kingdom, are you becoming more tactful in dealing with troublesome mortals and more tolerant in living with stubborn associates? Tact is the fulcrum of social leverage, and tolerance is the earmark of a great soul. If you possess these rare and charming gifts, as the days pass you will become more alert and expert in your worthy efforts to avoid all unnecessary social misunderstandings. Such wise souls are able to avoid much of the trouble which is certain to be the portion of all who suffer from lack of emotional adjustment, those who refuse to grow up, and those who refuse to grow old gracefully.
14:5.10 Love of adventure, curiosity, and dread of monotony—these traits inherent in evolving human nature—were not put there just to aggravate and annoy you during your short sojourn on earth, but rather to suggest to you that death is only the beginning of an endless career of adventure, an everlasting life of anticipation, an eternal voyage of discovery.