Alexei Polookhinadded a comment 6 years ago
He is double my age. — Он вдвое старше меня.
Я вдвое старше его. — I am double his age.
старше в два раза
Twice as old
Twice (his) age
double (his) age
double the age
He is double my age. — Он вдвое старше меня.
Я вдвое старше его. — I am double his age.
DOUBLE HIS AGE sounds horrible. It's more common to say TWICE HIS AGE.