No fuckup - don't let your inner kid die, like excitement and enjoyment of little things. Don't let people dictate what you must enjoy, just because they decided that they was "too old" for something and restricting their happiness themselves or with the help of other "grown-ups". Like a prion or virus it will grow and copy the lockdown of wonder and we must stand up for ourselves and the right to live the life we love! Go on and be a PhD that doesn't hate your life at 40, you have the bigger end of the stick!