Every domain's chance of sale will increase with age. It is like a perpetual lottery. And it makes us give a false sense of importance to domain age. But the truth is, you pay a renewal every year, you have think if the renewal is better spent on another name? Well you won't get a good name for 10 bucks, but you have think ig it is better to renew 5 such names or get a better names from the closeouts
But think from the POV of a buyer. Given the choice of two domain names, will he chose the one that is older? That won't even come to his mind.