Where’s the beef? The better question may be what’s in the beef.

What’s believed to be the world’s oldest McDonald’s Quarter Pounder is about to celebrate a milestone birthday.

Casey Dean and Eduards Nits purchased the Quarter Pounder — since dubbed the “Senior Burger ” by its keepers — from a Golden Arches location in Australia back in 1995, and this November, the old burger turns 30.

Dean and Nits have kept the Senior Burger carefully wrapped in its original, McD’s-stamped beige paper packaging all this time — though it looks like it hasn’t aged a day.

Despite having never been refrigerated and spending the past 30 years being stuffed in cupboards, garbage bags and sheds, it’s still “eerily intact” and hasn’t developed any mold or bad odor, Dean, a dog trainer and musician, t

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