Is Goku stronger than Android 18 and 17?
Android 18 is very likely on the same level as Piccolo or maybe slightly stronger or weaker. Android 17 on the other hand is definitely stronger than SSJG Goku but not stronger than SSJB Goku.
Is Android 17 stronger than Goku?
Prior to the tournament, 17 forced Goku to go Super Saiyan Blue, which is a strong indication of just how powerful he is. Apparently, he has enough power to rival someone who possesses divine energy. This feat means that 17’s strength eclipses that of most Z-Warriors and even Majin Buu.
How old were Android 17 and 18?
Assuming their number designation could be a hint to their approximate age when they were introduced, as they were kidnapped as children, this would make both Android 17 and 18 in their late 20’s or early 30’s by the end of the Dragon Ball Super anime.