age of used computers

I would like to thank you for the information that you provided. I struggled with the serial numbers, but did not have access, immediately, to the model numbers. So I bought 2 iMac's, one for my own use and one to resell. I did not receive your information in time to make an informed decision, but I will live with what I"ve got. One iMac is a 2011 model with 3.1 ghz i5 and one is an iMac 20102.8 ghz i5 both with no keyboard and no memory cards. $650 Can. both both including taxes and buyer premium. I would have liked to own a newer iMac but I took a chance. Ron