I can't make sense of this math…

Last week, while they were on Spring Break, Char piled up all the kids and took them to the YMCA to play in the morning. Then they went to an early showing of “Horton Hears a Who.” After the movie, they went out to lunch. When they came home, got out of the car and were walking up to the door, Lily said, “Mom, I’m bored.”

Char and I got married ten years ago in January, 1999. Lily was born almost two years later in September. So here’s the thing: If she was born seven-and-a-half years ago, where did this teenager come from?