ist ungefähr so alt wie

is about as old as

→ sein
phrase Rare #39,787
is about as old as Used to compare someone's age with another person or thing; the subject comes before the phrase.
GE: Meine Cousine ist ungefähr so alt wie ich.
EN: My cousin is about as old as I am.

Sie ist ungefähr so alt wie meine Schwester.

She is about the same age as my sister.

Er ist ungefähr so alt wie ihr.

He’s about the same age as her.

Tom ist ungefähr so alt wie ich.

Tom is about the same age as me.

Er ist ungefähr so alt wie du.

He's about the same age as you.