Remember, MOST people are not geeks. MOST people were in the jock, stoner or other club and were busy sedating their brains while growing up so they could settle into their blue collar lifestyle.
I'm not sure what your point is. If you believe this then it doesn't matter what age people are, they are all technically clueless whether they play angry birds or pong. My point is the OP has a superiority complex about technology based falsely on his youth that is probably not going to go over well with people he wants to press his ideas upon.
If he regurgitates Ty13rDerden's points, they are going to turn glossy eyed and dismiss him because the only one that isn't just PR fluff is the rate of return on $15. If they are shrewd investors then they'll probably keep him talking about Bitcoin to extract what he knows about it. Then they would think, why don't I just spend the money and buy it directly myself? And that would probably return more than buying a bunch of gear to mine at the current difficulty rates while letting the OP take 75% to 90% for himself.
They only way to pitch this is to show them the mining profits vs. investment vs time and give them a good rate of return that would beat just buying bitcoin themselves with their own money. If you absorb some of the initial startup costs and pitch in with some real money towards their real costs (rent), then they might start to listen.