Unfortunately, most of the methods usually used to determine body fat are woefully inadequate and rife with potential problems.
The measurement of body composition is an inexact science, and outside the laboratory, it becomes an even more inexact science.
As it stands now, sooner or later, your prostate will start to swell up like the dinner rolls momma's baking in the oven. At best, this unwanted hypertrophy will just obstruct urine flow. At worst, it'll develop into cancer.
The Joys of Salivary Hormone Testing
The Care and Feeding of the Liver