so old
Il est si vieux qu'il se souvient d'une Belgique unie.
He is so old that he remembers when Belgium was united.
You’re not that old.
Tu n'es pas si vieux, Tom.
You're not that old, Tom.
Tom ne me semble pas si vieux.
Tom doesn’t seem that old to me.
Tom n'est pas si vieux que ça, n'est-ce pas ?
Tom isn't that old, is he?
You're not that old.
Je ne pensais pas que vous étiez si vieux.
I didn't think you were that old.