The AGE of a domain is the most recent registration date
The HISTORY of a domain is the first registration date
To avoid misleading buyers into thing a domain has an older age than it's recent registration date, please use the term "History" when referring to a previous registration that already expired.
Age is lost when a domain expires and starts over from scratch upon new registration.
Feel free to relist your domain for sale using accurate AGE and History references so buyers understand what they will be bidding on.