There was a great sci-fi book (imho) by Robert J. Sawyer that posits the use of nano-tech to enable age reduction called Rollback (https://en.wikipedia.org/wiki

There was a great sci-fi book (imho) by Robert J. Sawyer that posits the use of nano-tech to enable age reduction called Rollback (https://en.wikipedia.org/wiki/Rollback_(novel) https://en.wikipedia.org/wiki/Rollback_(novel)). This just made me think of that book.