To what age does Marguerite return to upon Eddie's request?

Marguerite returns to the age of forty-seven, the age that Eddie last remembers her.

"He thought for a moment. "Can you change it?"

"Change it?" She looked amused. "To what?"
"To the end."

She lowered her arms. "I wasn't so pretty at the end."

Eddie shook his head, as if to say not true. "Could you?"

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When he moved his head back, she was 47 again, the web of lines beside her eyes, the thinner hair, the looser skin beneath her chin. She smiled and he smiled, and she was, to him, as beautiful as ever, and he closed his eyes and said for the first time what he'd been feeling from the moment he saw her again: "I don't want to go on. I want to stay here."