Leslie Kenny will celebrate her 60th birthday next year, yet according to a biological age test she is a positively girlish 21 years old. Discovering the secret of eternal youth would be a feat for even the most genetically blessed and clean-living among us, but for Kenny, who was diagnosed with three autoimmune diseases — lupus, rheumatoid arthritis (RA) and Hashimoto’s disease — at the age of 39, and told she may only have “five good years” of health left, it is even more remarkable. It is