Frankie Muniz turned 15 years old in 2000.
Frankie Muniz will turn 25 years old in 2010.
Frankie Muniz turned 24 in 2009.
He was 17 years old in 2002
Frankie Muniz was 14 years old when Malcolm in the Middle first aired. He was 20 years old by the end of the series.