(AP) -- You may joke with your dad about his age. But he may be defensive about how old his underwear is.

According to a recent telephone survey by Kelton Research, on behalf of Jockey International Inc., more than a quarter of men say their shorts are more than 4 years old.
Their underwear is anything but underworn -- 77 percent admit that their ancient undergarments haven't stood the test of time and are tattered, discolored or stained.
In fact, nearly a third of the 500 men surveyed said their old boxers or briefs no longer have elasticity, while 15 percent said they have underwear that doesn't fit and 14 percent said they keep pairs that are covered in holes.
Underwear a decade old or older are in the top drawers of 11 percent of men, while only 2 percent said they have kept undergarments that are more than 20 years old.
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