Laughter gets rid of the wrinkles

"Dans le rire, l'humanité nivelle ses différences et efface ses rides" Monique Proulx.

~ "Through laughter, humanity irons out its differences and rubs out its wrinkles."

I came across this wonderful quote on the Terre d'échange series of cards by Belgian firm Claire-Vision. I'm always on the lookout for quotes for sermons or calligraphy and they put great words together with wonderful photos.
Then of course I struggled as always with the translation. Should it be in or through laughter, should it be equals out or irons out its differences ... translation is all about making decisions and learning to live with making the wrong ones sometimes.