How many years are really worth it, though? Is an extra 20 years of miserable old age worth 5 years of youth? I'm not wholly certain that's the case.
That's why one should exercise and eat right. There is a strong correlation between regular exercise/healthy body weight and a productive old age. It amazes me how cavalier people are about their bodies.
Almost all decent places to live in the world have an average male life expectancy of over 70 years!
ok then...
"You're 38, half your life is behind you already"
Nitpick: The chart you responded to set out life expectancy at birth. If you're 38, your remaining life expectancy is non unsignificantly higher.
It's like the good side of Zeno's Paradox. If you're alive at age X, your expected number of days to live is still significant. For US males, your life expectancy doesn't fall below one year until you're 113.