We have forty million reasons for failure, but not a single excuse.
— Rudyard Kipling

forty for you, sixty for me And equal partners we will be
— Gerald Barzan

But you can't focus on things that matter if all you've been is asleep for forty years. Funny how sleep rhymes with sheep. You know.
— Charlie Sheen

Forty is the old age of youth, fifty is the youth of old age.
— Victor Hugo

Men over forty are no judges of a book written in a new spirit.
— Ralph Waldo Emerson