The definition of lifespan is simple - it's the number of years that you live. Defining healthspan is a bit more complicated. In this podcast, Dr. Martin Katz and Dr. John Glidea discuss the physical, mental and community-related aspects of healthspan.
Martin mentions Phil Maffetone's VO2 max research which can be found here.
John mentions tests for your biological age (vs. chronological age) which can be found here.
Heart rate recovery ( HRR ) is commonly defined as the decrease of heart rate at 1 minute after cessation of exercise. A 1999 study found Median HRR was 17 beats per minute, with a range from the 25th to the 75th percentile of 12 to 23 beats per minute. HRR under 13 is bad.
A transcript of this podcast can be found here.