There is no scientific proof that if you wanted to be a pilot from a young age versus stumbling across the advertisement and decided to apply, you will be any better in training or have better aptitude for the skills in which the job demands. That is a myth.
BAe 146-100,
No one mentioned that the ones with passion are more successful in training. It's just really annoying to see someone who does not possess any interest towards aviation nor has any idea about a plane flies, to get caught by an advert on FB, and be offered a place on the scheme, while other applicants whose eyes turned always skyward, willing to do anything for the sake of flying, not to have the opportunity to make some dreams come true.