The earliest known connection between Epstein and Princess Diana is:
Jacob Frank (Jewish)(1726-1791) survived through three children, daughter Eva Frank and sons Joseph Frank and Roshas Frank. Roshas Frank reversed his name and is known in Europe as "Frank Roche", which genealogists connect the surname Roche to Princess Diana
https://www.printernational.co.uk/timmann2/history.htm#diana
Clinical trials now for Parkinsons use a precursor dopaminergic neuron stem cell. All worked so far, which means in a few years time this will be rolled out. If you study Aubrey de Grey on this subject, aging itself will be the primary target.
https://www.printernational.co.uk/timmann2/age_regression.htm