Oh Grow Up!
The Statute of Laborers (England, 14thc) specified sixty as the age of being old; that is, after age sixty, the stipulations of wage regulations no longer applied.
People generally did not record their exact age, and ordinary folk often had only a vague idea.
They didn't use A.D. and B.C. Regnal year or more usually some local lord. Knowing your age would require reckoning.
Chief concerns were shelter, food, health care. Many peasants had retirement contracts, and not always with one's relatives.
Someone got use of cottage, lands, equipment, in return for a place to stay, food, clothing. Sometimes a contract might be imposed by village or lord when a peasant became too old to work effectively—it's not surprising that some peasants might claim they could still work, and not make such arrangements voluntarily.
Contracts were usually voluntary, often to a son when he took over the lands and buildings, or to a daugher upon her marriage. They could get detailed, specifying the type and value of clothing, the amount and kind of food, etc.
It might also happen on the peasant's deathbed, in order to provide for surviving wife and children. Even cottagers made these contracts, though they had little to offer. Often, they wound up making the caretaker their heir.
Some arrangements allowed for remodelling for a separate room or even the building of a mother-in-law house. They even had provisions for visitations when sick, and prayers when dead.
These contracts were always conditional: if the caretaker failed in his duties, the lands etc. reverted to the owner.
In Elaine Clark's study, only one in twelve peasants were able to retire to a separate house; the rest were co-resident with their caretaker. Only a third of the 200 contracts she investigated were with their own children.