What did knights do after retiring?

Answer 1

A Knight in a sense could never retire, he has placed upon himself a sacred oath to the crown or his liege lord to be ready to fight in the defence of the country for two thirds of the year but luckily older knights weren't often called up.

A knight was often given a tract of land, unfortunatly this land was not terribly large and was probebly only enough to feed the family and make a small income, so knights had to take on other options such as government work, as a local justice, ranger, or sherrif or to act as a castellian or Master-at-arms for a castle or even become a mercenary or brigand, to earn enough money to keep his family comfortable.

Answer 2

After retiring, knights would typically receive a pension or land grant from their lord in exchange for their years of service. Some knights may have chosen to become a steward or administrator for their lord, while others may have turned to more peaceful pursuits such as farming or trade. Many knights also participated in religious pilgrimages or charitable activities in their later years.