Princedietrich,
Bear in mind that the TCDS limitation of 16,663 hours is for the wing. I don't know anything about the airplane you flew, of course, but it may have had an exemption or might have had a different wing. I've flown a number of aircraft over the years which have had different wings, some as many as three or more due to their high times. Replacing a wing, spar or components isn't uncommon in life extention. If an aircraft is properly maintained, the life can be virtually limitless.
Bear in mind that the TCDS limitation of 16,663 hours is for the wing. I don't know anything about the airplane you flew, of course, but it may have had an exemption or might have had a different wing. I've flown a number of aircraft over the years which have had different wings, some as many as three or more due to their high times. Replacing a wing, spar or components isn't uncommon in life extention. If an aircraft is properly maintained, the life can be virtually limitless.