The Master said, "At fifteen I set my heart on learning; at thirty I took my stand; at forty I came to be free from doubts; at fifty I understood the Decree of Heaven; at sixty my ear was atuned; at seventy I followed my heart's desire without overstepping the line."-The Analects, II.4, trans. by D. C. Lau.
What a glorious life !
References: Confucius, A Great Philosopher-Prophet