Telomere testing- ostensibly is a measure of cellular health.  Many of these are mail-order tests that measure the length of the telomeres- the strands of DNA that make reproduction of cells possible.  However other genetic encodings have stronger effects on longevity and health than do telomere length.  For instance, non-whites have longer telomeres, but have a shorter life expectancy.  Therefore telomere length testing is not a good measure of either cellular health or longevity. Until refined, this test is considered irrelevant.