I'm trying to find the manufacturer and age of French Patio Doors
The actual glass was made by Ravensby Glass Co. And the company that made the doors is called Rehau. They mold(ed) plastic frames anyway.

Here's a link to their home page: http://www.rehauhome.com/default.aspx

I think that you'll need to contact them to figure out the age... but sometimes the date of manufacturing is part of the numbers... like 12608 might mean 12/6/08. In Europe that would be June 12, 2008... in USA, it's December 6, 2008... but then again, sometimes the number refers to the day that the design was created- not the actual door, and then of course the number might be meaningless- just a fingerprint.