I would guess that his telomere length would have been LONGER three years ago because there would have been many stem cells in crisis with lengthening but damaged chromosomes. But I believe his percentage of critically-shortened telomeres would have been higher (typically in the teens)
telomere shortening was rapid in the blood cells leading up until a few years before cancer diagnosis. In those years before diagnosis, the telomere lengths appeared to stabilize.
After two years of TA-65 use, his median length is now 12,500 (from an estimated 9,400) with a very nice drop in critically-short telomeres to 4.5% (from a baseline of up to 20%). So if you believe what most research is showing regarding the connection between shorter telomeres and longevity, Mark has gained over 30 years of longevity in a time where he should have lost three years.
I learned today that in 9 months, my January 2014 average leukocyte length decreased 500 base pairs but the Percentage of critically-shortened ones improved from 11.9% to 10.2%.