New Old 40th Birthday

40 is also like the new third law of thermodynamics but it's less catchy & then you have to explain how 30 is like the second law of thermodynamics & I'm sure someone will say "Why second? Shouldn't 30 be the third law?" & you'll have to explain that while there are 4 laws they start with Fowler's zeroth law & everyone will get caught up on the word "zeroth" & if it really is a word or not but it is. Google it. Folded: 40 is the new old.Unfolded: 40 is the new 30! Don't worry - you're older but still so young and fun. Happy 40th!