Typical high amperage applicance power cord age
The conditions the cord is exposed to will affect the life of the insulation, high heat and light exposure are 2 things that age insulation. If the cord is still flexible and there are no cracks it should be fine. I had a dryer that I kept going for 20+ years that the cord was still in good shape but, when I updated the wiring to a 4 wire receptacle, the 3 wire cord had to go.