Which may or may not be because your groundbreaking hangover medicine is poop, with some herbs and stuff mixed in. Turns out, ancient Egyptians were massive fans of the medicinal use of s**t for a vast variety of illnesses and ailments. Of course, they didn't just prescribe a turd Snickers for a broken arm. Unfortunately, this is because that would have been too sane. Poop medicine was almost an art form for Egyptian doctors. Feces from various animals -- up to and very much including humans -- was used to cure ailments ranging from burns to eye disease.
Presumably, roughly 120 percent of all ancient Egyptians had permanent pink eye.
The fact that most Egyptians died before they reached their 40s is probably just a coincidence.