- You cannot cast the spell on yourself.
- The person has to currently be alive, spell doesn’t work on the dead I’m afraid.
- They are paused at their current age.
The practical option would probably be some wildly prolific Doctor or Scientist that could do sustained good for humanity. My heart says it should be some figure like Mark E. Smith that would continue doing what he does forever, being able to see his dystopian sci-fi lyrics come to fruition and just wandering around scaring people from the future who think that’s what all people from the 21st Century were like.