The age of the amp isn't a factor unless it's deteriorating. You didn't say what the power is, but unless you're pushing its limits, you should be OK. I spent a couple fine years using a Carver that had been "on the shelf" since the 90's, and was old then, to power a 2 channel analog system and it was great until that fateful day when I got hit by lightning and the Carver got fried....a sad day. Just trust your ears and see how it sounds...if it's good, use it and enjoy.