We grow too soon alt, und too late schmart. --Pennsylvania Dutch

(Should be "Pennsylvania Deutsch," actually, shouldn't it?)

I've seen this countless times in cheap touristy booklets of "PA Dutch" or "Amish" sayings, yet I've never heard a genuine Pennsylvania Dutchman/woman actually say it

Concur in every particular. Does it have a more-than-apocryphal history, or is it perhaps just another Urban Legend?