Jane Says: Consider Where Your Eggs Are From, Not Their Color. A yolk is a yolk is a yolk is a yolk, regardless of its hue. Feed mixed with marigolds or paprika lends its tone to henâs eggs. (Photo: Mike Harrington/Getty Images)
The normal range of testosterone levels in healthy adult males is between 280 to 1,100 nanograms per deciliter (ng/dL), reports the University of Rochester Medical Center. Itâs important to determine if a low testosterone level is due to normal aging or if itâs due to a disorder.
There are other factors though that go into determining low T, high T or normal ranges of T in the system, but only a doctor can make that conclusion. Here is another way to look at ranges testosterone levels in men by age: High testosterone levels in men by age: 1  Men over 30: 1,009 ng/dL. 2  Men over 40: 993 ng/dL.  Men over 50: 918 ng/dL.