Eleven?

The other day when we were driving to M&M's soccer practice, Blondie said to M&M, "You're 11."

M&M said, "No I'm not. I'm 10"

Blondie: "No, you're 11."

M&M: "Nuh-uh, I'm 10!"

Blondie: "How would you know?!?"

At this point I was really confused and piped in that M&M was 10 years old. Then Blondie said to M&M, "No, the number on your shirt is 11!" (She was wearing a soccer jersey.)

Then we realized what she had been talking about the whole time and M&M looked and said, "No, the number on my shirt is 14, not 11."