How old is my Quasar Microwave oven - Model MQ5500?

This microwave has been working and I’m trying to find out how old this item could be. So far it works beautifully and all parts are original.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0