Whatever a person sees as a vocation, if they can retire from it, it isn't a vocation.

Teachers, doctors, etc, eventually all retire.  Most I would argue do not define themselves by their jobs.

Priesthood is who a person is.  You can retire from active ministry, but you cannot retire from being a priest.  Priesthood is the person and the person is a priest. Being a parent is who someone is.  Once a person has a child, they are forever changed--they are a parent.  They cannot give up being a parent.

A person can stop being a teacher, doctor, lawyer, etc, even if they choose to define themselves by those career paths.