From Wikipedia:
While modern life expectancies are much higher than those in the Middle Ages and earlier,[244] adults in the Middle Ages did not die in their 30s or 40s on average. That was the life expectancy at birth, which was skewed by high infant and adolescent mortality. The life expectancy among adults was much higher;[245] a 21-year-old man in medieval England, for example, could expect to live to the age of 64.[246][245]
Not so much for the men who actually worked:
From Wikipedia: While modern life expectancies are much higher than those in the Middle Ages and earlier,[244] adults in the Middle Ages did not die in their 30s or 40s on average. That was the life expectancy at birth, which was skewed by high infant and adolescent mortality. The life expectancy among adults was much higher;[245] a 21-year-old man in medieval England, for example, could expect to live to the age of 64.[246][245]