Just a thought; is it possible that Serrin was actually older than Dart, in terms of years lived when they recognized?
She was definitely older than Dart - much older! No matter how long it took for Dart to go in wrapstuff.
When I skimmed NB #13 today I realized a panel with Woodlock and Rainsong on a mural - and Wing counting on for them. That was before the Recognition scene.
Woodlock and Rainsong were not considered Elders in EQ#1 ... somewhat between 100 and 500 years old, I guess. Wolfriders can reach a lifespan of 2500 to 3500 years, as far as I remember. When these two were dead it must be hundreds of years - probably much more than thousand years since the disappearance of the Palace.