Requested by @dax
  1. Wear sunscreen
  2. Enjoy the power and beauty of your youth
  3. You are NOT as fat as you imagine
  4. Don't worry about the future
  5. Don't solve algebra equations by chewing bubble gum
  6. Real troubles blindside you at 4pm on idle Tuesday's
  7. Do one thing everyday that scares you
  8. Sing
  9. Don't be reckless with other people's hearts
  10. ...and don't put up with people who are reckless with yours
  11. Floss
  12. Don't waste your time on jealousy
  13. The race is long, and in the end it's only with yourself
  14. Remember compliments you've received
  15. Forget the insults
  16. Keep your old love letters
  17. Throw away old bank statements
  19. Don't feel guilty if you don't know what to do with your life
  20. ...the most interesting 40 year olds don't
  21. Get plenty of calcium
  22. Be kind to your knees... You'll miss them when they're gone
  23. Maybe you'll marry, maybe you won't
  24. Maybe you'll have children, maybe you wont
  25. Maybe you'll divorce at 42, maybe you'll dance the funky chicken on your 75th wedding anniversary
  26. Don't congratulate yourself too much, your choices are half chance like everybody else's
  27. Enjoy your body, use it in every way you can
  28. Dance...even if it's in your own living room
  29. Read the directions...even if you don't follow them
  30. Don't read beauty magazines
  31. Get to know your parents
  32. Be nice to your siblings...they're the closest link to your past
  33. Understand that friends come and go, but only a few precious ones hang on
  34. The older you get the more you'll need the people you knew when you were younger
  35. Live in New York City once; leave before it makes you hard
  36. Live in Northern California once; leave before it makes you soft
  37. Travel
  38. Accept certain unalienable truths
  39. Prices will rise
  40. Politicians will philander
  41. Respect your elders
  42. Don't expect anyone else to support you
  43. Don't mess too much with your hair, or by the time you're 40 it'll look 85
  44. Be careful whose advice you buy
  45. Be patient with those who offer it
  46. Advice is a form of nostalgia... A way of recycling old memories and wiping the past away
  47. But trust me on the sunscreen