40 to 49 years: 0 to 2.5 ng/mL
50 to 59 years: 0 to 3.5 ng/mL
60 to 69 years: 0 to 4.5 ng/mL
70 to 79 years: 0 to 6.5 ng/mL
See also: http://www.uptodate.com/contents/screening-for-prostate-cancer
See also: Calculating Prostate Volume (BPH)