I was able to locate an obituary from an OH newspaper after Lucy Virginia Gauby's (aka Jenny Panell with multiple spellings and Faust, and Arnett, as you indicate) which clearly indicated she was the same person otherwise seen as "Jenny."
I received today a death certificate from the state of Ohio indicating her parents were Samuel C. Pannel and an "unknown" Pugh, both of Virginia.
Subsequently, I was able to locate census records indicating "Virginia" lived with her parents, Samuel and Nancy Pannel, for a time, after Porter Faust's death.
I have also found an on line record in the VA marriage records, of a Nancy Pugh and Samuel Pannel in Albermarle, VA Nov. 2, 1839.
It appears that Lucy Virginia / Virginia / Jennie was their youngest child, and that Samuel was about 15 years older than Nancy.That may answer your question about their rather "advanced" ages at the time of her birth.
I hope some of the above is helpful.I have not yet been able to find parents for either Samuel Pannel or Nancy Pugh, but what I explained above was a bit of a breakthrough for me.Jenny would have been my great-grandmother, as her daughter, Cora Emma Arnett - Yount was my grandmother.
If you have any additional info to add, please post!I know my grandmother was partly of Native American heritage - a significant % - perhaps 1/4 .I would really like to find that connection to my heritage!