Signs, signs, everywhere there's signs … And assuming the 40th Birthday girl or boy has a good pair of reading glasses, they'll be chuckling along with the hilarious aging signs writ large and colorful and truly funny on the fortieth Birthday card featured here. Forty represents roughly the halfway point in life, and so any of your friends, relatives or workmates turning the milestone age deserve to be treated to some hysterical humor to cushion the blow. The joking gagline signage on this garrulous greeting will distract them from the sobering fact that they're on top of the hill … and all signs point to them heading over it.