Fortnite is almost 10 years old, I'd be interested to see the average age of the playerbase. People have less time for games when they get older.
My 11 year old son plays Fortnite almost daily. He plays other games too but Fortnite is what he plays with his friends online.
My nephew was deep into Fornite for years - now at 15 he (and his friends) moved on to GTA V. Imagine what a treasure trove of gaming you can discover as a teenager today, looking back at a pool of 15-20years of great games.