Why are so many little Kiddis so good at Fortnite?

I'm always killed by 10 year olds! Why are they better than me?

Your idiom does not show you quite mature, do you realize? Why they are better, why they kill you has nothing to do with age. Today's youth are learning things quickly, you have to accept that. With your question, you have not expressed yourself quite grown-up that you should remember. Now you probably belong to the "Kiddis"?

They play it almost every day, and are sometimes a bit faster than we "old" sacks.

Fun aside, it's just because of the constant training and kids remember hiding places or loot places better at this age.

Fortnite is their life. And stop playing the game before it's too late! Play rather PUBG or something else where you need skill