3

I've seen the following set expressions:

  • Она на ... лет моложе/старше меня.
  • Это в ... раз меньше/больше.

Are the prepositions на and в interchangeable in these contexts? If not, is there any rule justifying the employment of на and в in the respective examples?

Or those prepositions are there just "because"?

4

на is addition or subtraction (на двадцать лет старше means "twenty years older"), в is division or multiplication (в два раза старше means "two times as old").

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