And soon you learn how it feels to watch as everyone else slips away with the passage of time. Especially when you play with the grandchildren of your grandchildren.
(Am I doing this right?) Or you're immortal but you become a testing ground for scientists trying to unlock the secret of immortality!
Granted; however you'll soon learn that the means rarely make things better. When things go well, more flock to use you. When things go badly, many want revenge against you. Every wish you grant is another roll of the die. Many wishes will be corrupted spectacularly, and perhaps those that succeed only treat a symptom rather than a root.