Water Pump- Should I Trust IT???

I bought my 66 Fury in 1991. The PO gave me a spare water pump he had.The car had been stored for 8 years. The pump appeared to be rebuilt and never used- the seal and impeller looked new. I installed this pump in 2018 when the seal failed in the old pump. The pump is working perfectly, but it would seem that the rebuild is at least 38 years old. Am I on "borrowed time" with this pump?? Thanks for your good advise! Lindsay
Author: '66 Fury I