I’m gonna guess since they never explicitly state their ages: Pellus would be somewhere in his mid 30s while Lithera would physically be in her late 20s-early 30s. I would say when the story begins she was physically around 24-25 and then the story progresses from there.
She said she lived over a hundred years, right? But what’s the exact number? What’s her physical age? And how old is Pelleus?