Is there a word for someone who has a perfect life?
You could say this hypothetical person lives a charmed existence. I've not heard someone described in the one word, charmed, but I suppose it could be used alone.
Her life is perfect. She lives a charmed existence.
Or,
His life is perfect. In short, he is charmed.
He is blessed.
This word also has other (religious) meanings and connotations but you could use it here.
characterized by happiness or good fortune.
a blessed time - Collins dictionary