When I was 9 I breed my first pair of betta. At 14 I jumped into FH, my first Flowerhorn lived in a 55 gallon, when I turned 15 I had my first Arowana (jardini) in a 90 gallons (Sold at 16"), and now I am 17 and I have a 360 gallon with water clean enough to drink. I've had every Arowana except a Black aro and an araprima. I am not showing off I am just trying to say I am young and I consider myself a kid, but I understand keeping fish is a huge responsibility. I am not rich, and paid for almost every fish I own, along with the equipment. I have had fish die, but I am sure that's everyone.
Adults impulse buy fish all the time. Anyone can be ignorant.