Forum:PB's age continuity in Princess Cookie

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First, I'll add the things we know about Princess Bubblegum's ageing process: So we get from this information that PB's age is not exactly consistent and she doesn't grow naturally in the same way Finn does for example, but we're not exactly sure if she's continuously ageing or if she is perpetually 18 until she adds a large amount of biomass to herself. When she is consuming other candy people, is it making her grow older, or is it making her remain at the same age? Could PB actually be far older than we know, far older than '18'?
 * She is biologically 18 years old
 * Her age is dependent on bodymass and if she loses too much of it she can become younger
 * According to Pen, she consumes other candy people regularly to "replace lost biomass", as seen in Video Makers, and can grow older if enough biomass is added as seen in Too Young

There are many factors leading us to believe that this may be the case, like how if she was 18 she can't have been ruler for very long, and how old is Lemongrab? And how long has she known Marceline? But the latest episode gave us another huge factor to work on. In Baby-Snaps' memories of the orphanage we see that he is far younger, in his childhood. But PB somehow retains her 18-year-old appearence in the memory. How long ago was this? Does Baby-Snaps age quickly, or does PB age incredibly slowly? They certainly don't seem to age consistently with each other. Peppermint Butler ALSO seems to be far more childlike, he is dancing around with the other candy children when PB is reading the story.

Is this a continuity error or is this blatant fact that PB does not age? Or was it, well, only a couple of years ago? What's your opinions?