It takes a long time to truly grow up. Here's Confucius' journey:

   At 15 I set my heart on learning; 
   at 30 I firmly took my stand; 
   at 40 I had no delusions; 
   at 50 I knew the Mandate of Heaven; 
   at 60 my ear was attuned; 
   at 70 I followed my heart's desire without overstepping the boundaries of right.