why are you projecting ? how did you come to that conclusion. maybe Ash is scared of the responsibilities that come with being an adult, as he hasn't experienced it, maybe due to him being a child in his previous life, he felt he has some irrational fears of becoming like his assumingly horrible parent or maybe i don't know how Killua looks when he's older like everybody else- all I'm saying is '' you're kinda sus''

trying to make it seem dramatic and maybe adress it like he's annoying the ROB.