Answer:
anyone in medieval society below the middle class. working class citizens, serfs and the homeless.
Answer:
A medieval peasant was essentially a farmer who lived by subsisting on a plot of land. This land was not owned by the peasant, it was owned by a landlord who allowed the peasant to work the land in exchange for a tallage (a sort of tax) which would usually be a portion of his harvest.
In social and economic terms, peasants were among both the poorest and most common people in medieval europe, probably constituting upwards of 90% of the population.
In short, life as a medieval peasant was hard and their life expectancy reflected that. The life expectancy of a peasant was approximately 30 years.