Reese was 15 in the debut episode, because he said he was a year older than Malcolm.* The MITM Wiki says he is 22 months older than Malcolm, born December 5, 1986. It gives Reese's birthday as February 25, 1985.* Teen actor Justin Berfield, born February 25, 1986, was actually younger than the diminutive Frankie Muniz, born December 5, 1985.