What should I know about Longevity Männer?

A longevity test for men typically examines biomarkers such as telomere length (TERT gene), thyroid markers (TSH, free T4, free T3), and genetic variants linked to aging. The evidence is mixed: TSH/fT4/fT3 are well-established clinical markers (guideline-supported), but direct-to-consumer telomere tests often overclaim. Telomerase (TERT) maintains chromosome ends, but lifestyle lengthening is unproven – observational studies show only small effects. Genetic variants in DIO2, TSHR, or FOXE1 explain <1% of TSH variation and have no individual clinical utility. Moreover, most 'longevity' markers lack randomized trial data. Bottom line: basic thyroid screening is useful, but most DNA-based 'aging clocks' or telomere tests are not sufficiently validated. Seek medical advice before purchasing expensive tests or changing behavior.