If that is so sammy then please enlighten us.
Anyway, people like this usually either get their kicks out of it or have a character flaw that just causes them to do that (for reasons unknown). I can be this way sometimes when some people are just too damn general and eventhough i have an ok idea of what they are talking about, i tend to make them be more specific. A lot of people hate that.
Its not always with age either. Some people just like to show off and or prove they are the creme de la creme. And with the age scenario, the elder usually is looking for reassurance of their "wisdom" or mental acheivements.
Meh. Im too tired to come with something that makes more sense but I never have too many problems with these types because i generally cant point out that flaw and could care less about them or the subject matter and therefore leave them either looking like assholes or dumbshits (most of the time). *yawn*