Today, there are some 200 different breeds. Goats have been used by the U.S. Fish and Wildlife Service, the Bureau of Reclamation, the Bureau of Land Management, and the U.S. Forest Service. State, county and city contractors (such as the city of Seattle) have also used goats for weed and invasive species control.
Recent data has redefined the way that urologists look at PSA, and what is considered a normal PSA. Age-adjusted PSA values take into account that a 40-year-old should not have the same PSA as an 80-year-old. Accepted age-adjusted PSA rates are below 2.4 ng/ml for men under the age of 50 and 6.5 ng/ml for patients in their 70s. Other limits have been defined for varying age ranges, but there is not universal agreement about the accuracy of the age-adjusted levels.
Answer: PSA levels do increase with age, in fact there have been age adjustments made to PSA levels that take this into account. The reason they go up as you age is not related to prostate cancer actually, but to a disease called benign prostatic hyperplasia or BPH.o therefore, men that get older typically have higher PSA levels. So the PSA age change is indeed a true one for most men as they age. The question of how often you should have your PSA level done really depends upon your age.