Not only this, but there actually had to be laws passed to prevent people from manumitting elderly slaves in order to ditch them once they were no longer productive. A whole new low I bet few people have ever considered!
In 1815, Georgia enacted the Old Age Relief Act to protect elderly slaves from abandonment and neglect. In the Code of 1806 in Louisiana stated that slaves disabled through "old age, sickness, or any other cause, whether their diseases were incurable or not were to be fed and maintained by their owners."