Good Times

In real life, we experience years of, e.g., study or work, then later recall "old times." While reading fiction, we vicariously experience series characters' careers, then maybe in a concluding installment they recall "old times," which means something to us because we have read them. A good biographical series incorporates the later years.

Poul Anderson's Adzel recalls the good days of the trade pioneer crew. And Agatha Christie's Hercule Poirot:

'Goodbye, cher ami', runs his final message to the hapless Hastings. 'They were good days.' For addicts, everywhere, they were among the best.
-copied from here.

Even better, we can reread them.