Life – a curved explanation

At age 4, success is...not peeing in your pants.
   At age 12, success is...having friends.
     At age 16, success is...having a driver's license.
       At age 20, success is...having sex.
        At age 35, success is...having money.
        At age 50, success is...having money.
       At age 60, success is...having sex.
     At age 70, success is...having a driver's license.
   At age 75, success is...having friends.
At age 90, success is...not peeing in your pants.