They obviously didn't come off as sarcastic, and the age comment is a total non sequitur.
And since we're now apparently on the subject of arowanas, I wouldn't necessarily say most people believe that, judging by the number of people on here keeping them in 180 gallon tanks. While larger would be much better, a 6x2 footprint provides enough space for an arowana up to almost 36" to live relatively comfortably (they are not built like most other fish, therefore they should not be treated as other fish in this regard). The main issue that makes people say that a larger tank is needed (and when I say "people," I mean people who actually have kept them in smaller tanks and thus are speaking from experience) is that in larger tanks, they don't jump as often and do not tend to injure themselves as they sometimes do in smaller tanks. I have experienced this issue a few times, but my arowana has actually calmed down significantly in the last few months, so it hasn't been a problem at all lately. So, of course I wouldn't recommend my tank size to someone looking to buy an arowana, and I would upgrade if such a thing were possible in my current situation, but right now, there are no problems with my stock, and I don't need you to call me out on things which, as far as I can tell, you probably know little to nothing about.