I have a question. I read somewhere, but can't remember now.
What is the name of the time travel scenario used in science fiction where you travel back in time in your own body?
The term for a mind migrating from one body to another is metempsychosis. Mental time travel might be called transtemporal metempsychosis. However, since this form of metempsychosis involves time travel and the person replacing their own mind with their own mind, this term can be expanded to become chronautometempsychois. Literally, time-self-mindswap.
Most people will prefer to keep it simple. For example, psychic time-travel has been used to describe this and that's clear enough.
The idea of this type of personal life-regression time travel has been used many, many times in all forms of media. (tvtropes link). But as far as I can tell, there's no generally agreed-on name for it.