Condition of the unit and use may be much more telling than the age. Buyer should always ask as many questions that may be of concern. Seller should always be ready to answer any and all questions or clarify particulars of a item up for sale.
Pricing should be determined by market value at time of sale. As seller may or may not gotten a "good deal when they made the purchase. How be it rare, some products go up in value. Listing the original MSRP if known at least provides some base value. I often assume original sale was 10 to 20 off list price. That is the best deal most are likely to have gotten. Spending a few dollars to obtain blue book value or other research keeps one from paying too much.
Pricing should be determined by market value at time of sale. As seller may or may not gotten a "good deal when they made the purchase. How be it rare, some products go up in value. Listing the original MSRP if known at least provides some base value. I often assume original sale was 10 to 20 off list price. That is the best deal most are likely to have gotten. Spending a few dollars to obtain blue book value or other research keeps one from paying too much.