The difference between immortals and mortals lies not only in words but is evident in age.
If Elder Lady Bao's lifespan were truly calculated like that of an immortal's, she would just now be in her middle years. Even if not in full bloom, she would at least retain her charms.
However, many noble family's immortals have taken elixirs that consume lifespan to break through bottlenecks, so few truly live beyond twenty thousand years.
In fairness, although Elder Lady Bao is over eight thousand years older than the current Palace Master of the Taichu Palace, under ideal circumstances, the two might still accompany each other for ten thousand years, which would be a beautiful story.
But seeing her appearance, one knows she doesn't have much lifespan left. It's unclear whether she was injured when young or took some aggressive medicine to improve cultivation.