Do this mean when 40, you're half way of a man's lifetime of 80? Today, life expectancy is 65, so would it be acceptable to say "LIFE BEGINS AT 32"?

No, I don't agree that real life begins at middle age. I believe, once a person realizes responsibility and starts acting upon his plans as early as 20's, that's real life. When there's an opportunity, why wait til 40? I rather believe "Early to start, early to retire."

Believe!