I have a challenge for you. Yes, a challenge. Here it is.
For the next eighteen years, I don't care how old you are, write a letter to your future daughter (if you are a guy, your future son). Tell her/him everything you think they should know about being your age. Do this on you birthday and write about the year that has passed. When your child turns a certain age, give them the letter from when you were that age.
You have been challenged, bet you can't do this.