If you asked 1,000 males what's their testosterone level, I am certain that at least 999 of them will say they have no clue.  
Abnormal levels of the natural hormone is able to lead to baldness (many a film star sex symbol was hairless from excess testosterone), and there's even a reported hyperlink best way to boost testosterone [why not try this out] Prostate cancer and excessively high levels.  
When amounts of testosterone are lacking, research has revealed a hardening of the arteries leading to heart disease, too much extra weight out of lower amounts of activity and electricity, loss of muscle mass and low testosterone levels also are directly related to a lower than the typical sexual drive.  
On face value, the medical researchers and industry might claim that normal is anywhere between 241 as well as 847 ng/dl (ng=nano grams and dl=deci-liters). But in fact this particular measure is misleading when utilized as an average figure for all men.  
The problem would be that young men (who would typically have a much higher level and be ) that is healthy simply do not get tested. It is but middle -men along with the elderly that have the blood tests required to find out their current fitness level.  
When the database is skewed with more mature male's testosterone levels, that will naturally be lower later in life - if you're a younger male and found to experience a level of 250 ng/dl, in fact you're at a below standard level.  
The healthy level for a male is somewhat better stated as closer to 800. At this level a new male's physical well-being is easily maintained, and the gentleman includes an energy for life and activity that will keep him healthy and fit well into aging.  
An older man with a similar level will not suffer the loss of muscle mass, and he will still be productive on the golf course well to his 80's.