When I was younger I used to backbite A LOT. Do I have to ask all those people for forgiveness?

Assalamu alikum.

I am 15. When I was around 12 I used to backbite more than you can imagine. That year I befriended two friends who would always gossip, and I later started gossiping with them. We used to gossip about almost everyone. We would gossip about a girl for wearing shorts. We would gossip about this other girl because she brags. We would gossip about another girl who is always trying to be cool. We would gossip about a boy who always tries to be funny. We would gossip about another boy because he flirts.

You get the point. The amount of people we gossiped about is so much.

Even though I knew it was haram, but still did it, I was young. Will I be held accountable by Allah(SWT) for all those people I gossiped about when I was younger but that I regret talking about now?

Now I try my best not to gossip and I tell my friends that I don't like to gossip. I accidentally let something slip every once in a while, and I do ask those people for forgiveness.

But my question, do I have to ask all those people that I gossiped about when I was 12 for forgiveness?

Jazakum Allah(SWT) khair