How Old Were Erik And Lyle Menendez 2024. They were 18 and 21, respectively, at the time of the shooting, according to. Erik menendez, right, and his brother lyle were convicted of murder in the 1989 killings of their parents.

Lyle was 21 years old and erik was 18 years old. Lyle menendez, then 21, and erik menendez, then 18, admitted they fatally shot their entertainment executive father, jose, and their mother, kitty.