In my experience in these games alot of the older passive people love to limp big hands from EP. Sometimes with the intent to repop vs a raise or just calling so i dont think we can completely discount these hands. Saying that i think some of the big hand will reraise earlier in the hand.
The way i looked at this hand afterwards is direct pot odds vs our equity against his range here. Were gettin 2.5:1 here which means what we need at least 28% equity to call right.
http://www.pokerstrategy.com
Board: AhQs6c9d3s
Equity Win Tie
CO 71.43% 71.43% 0.00% { AA, QQ, 99, 66, AQs, A9s, A3s, Q9s, AQo, A9o, A3o }
BU 28.57% 28.57% 0.00% { Ad6h }
So i think this call is probably break even here. If we decide that he opens at least AA or QQ than it gives us enough equity to call here vs pot odds.
This is minus any live reads that i fely i had.