I was gifted an entire box of oil paint - some used, some new, mostly vintage or out of production.  It doesnt make the paint bad; sometimes the recipe changes, the company updates its labeling, or goes out of business. So long as there are few chemical binders, oil paint will last years sealed and kept in temperature controlled environment. 

This was a vintage label Old Holland tube of Magenta - which I used for the color sleeve on the label! 

Painted from life