'Do not regret getting older. It's a privilege denied to many.' - It absolutely is a privilege denied to many. I've seen far too many amazing people denied the beauty of getting old with loved ones, so I will relish and take every birthday I am given.
I find memory can be a beautiful thing yet a curse. It holds precious things from your past, victories, happiness, etc. But it can also hold your failures and things that have hurt you. Keep the good memories close and forget the bad ones.