It's an ideal time for you to throw a party for all the people you've ever been and all the different selves who live within you now. Invite the teenager who once seethed with frustrated potential and the four-year-old who loved nothing more than to play.
Include the hopeful complainer who stands in the shadows and dares you to ask for more, as well as the brave hero who comes out every now and then to attempt seemingly impossible feats of happiness. Don't forget any of the various personalities who have contributed to making you who you are. Celebrate your internal diversity. Marvel at how good you are at changing.