Technically I'm 14, like you I am also forever young. My lore spans 5 novel length books now. It is possible we are just postponing the inevitable.
My original team grew up in a follow up book I was not a part of, leaving it open that perhapse in a few thousand years I might also eventually age.
My friend and you could say rival in the second book, Ecstasy, may be making an appearance in the next novel. The question is, what age will I appear when we meet again? After thousands of years, she now appears like she is in her late teens or early 20's. We're technically half sisters and were given the same genetic treatment.
Living the rest of Bear's life with this form may not happen. Who knows what the future holds.