I always thought 40 is when you go "over the hill." When my dad turned 40, that's when we busted out the black wreath and the armbands that said "over the hill" and "I come with no respect for the elderly."
So you've still got 10 more years of climbing until you're over the hill.
hope you had a good one!!
You're not over the hill until you're 6 feet under. Damnable, crumbsnatching, whippersnappers. 
