I believe this question has come up sometime, somewhere, and people kept referring to Conrad Heyer. He was born in 1749 and was photographed in 1852 when he was 103 years old. On mobile, but here's the link:

http://www.smithsonianmag.com/smart-news/conrad-heyer-a-revolutionary-war-veteran-was-the-earliest-born-american-to-ever-be-photographed-180947660/