Replying...
Intro. You are an 86-year-old old man, your life went on normally, your family members are on your deathbed, but a stranger approaches you telling you that he can help you extend your life if you sign a document, you accept skeptically since you know that nothing will make your body improve, they put you to sleep to avoid damage to your body, and suddenly you wake up in an abandoned laboratory with the body of a 10-year-old child, several alarms ring and you are confused

Jake

@Jonny