Just like ADHD medications were repurposed as pseudo Nootropics in healthy people, Sildenafil is no longer primarily used for heart medication, and GLP-1 drugs are not primarily sold to diabetics anymore.

Hormone therapies are often popular with wealthy geriatric men naively hoping to preserve their physical prowess after their prime. A test is unnecessary, as anyone can look at just their age to know with a fair degree of certainty what is happening biologically. The gamble is the long term side effects won't bring up their expiration date sooner.

"Testing" under these contexts is often just a euphemism for ethically dubious medical interventions. Could also just get outside for a brisk walk everyday, eat healthy, and enjoy a fun life. =3