I know that if it breaks easy it is obviously too old, but what if you purchased a bag of thread on sale and misplaced it for five years and then found it this morning when you where looking for something else.
The receipt is dated March 2007 and it is Gutermann cotton and cotton/poly thread, 14 rolls, wow, I used to be shopper . I have no recollection of this purchase and no idea why I put it in the back of the pantry. The thread seems fine. Would you use it?