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How old are you?” “Seventeen,” he answered promptly. “And how long have you been seventeen?” His lips twitched as he stared at the road. “A while,” he admitted at last.

Stephenie Meyer (2009). “Twilight: Twilight”, p.124, Hachette UK
How old are you?” “Seventeen,” he answered promptly. “And how long have you been seventeen?” His lips twitched as he stared at the road. “A while,” he admitted at last.