I just know that Lubavitcher girls light candle Friday night and they start at 3 yrs old. Reason being becuase that was Rifkah’s age when she married.
While we are on the subject of Rifka Imeinu, I once heard a shiur where the Rav told us that very few people came to her Levaya because they resented her for having a Rosho like Esav. Even though she was a Tzadeikes.