Salty called it correctly. You will look back and laugh about this. Maybe young people hate being reminded of what their own future looks like. Hence the repulsion at playing with older people.
As for today, right now, your best option is to find some neutral niche and enjoy what you can. You will learn to get along only if you choose to. The average age in WoW is 28. I have played with players who were 10, and one lady that was 80. Their toons looked just like mine, and they knew the game well enough to get all of their gear and toys just fine.
It is literally up to you how to proceed.