What is the shelf life of an old pack of military C-rations with the serial number of ssf 1023 b1 2 3fy?

If the cans ae not rusted thru they are good froever. We ate them as old as WWII and Korea 4 days out of 7 when I was in Vietnam and loved the newer 10 year old stuff..

Juat I would say in tact C-Rats are worth more as collector$ item$ now then as a substitute for a Big Mac, though. ---- Hey buddy, Wanna trade my 2-ham and lima beans for that pork Steak? ..... Where the hell did I put my P-38?