Frolic is a playful word with a happy history. It traces back to the Dutch word vroolijk (merry), which in turn evolved from a Middle Dutch combination of vro (happy) and the adjectival suffix -lijc (-ly).
A normal PSA level is considered to be 4.0 ng/mL (nanograms per milliliter of blood). 1  For men in their 50s or younger, a PSA level should be below 2.5 in most cases.  Older men often have slightly higher PSA levels than younger men.
Older male adults tend to have higher levels of PSA than younger men. The normal levels of PSA as per the age are listed below: 1  Men below the age of 50 years have normal PSA levels that are less than 2.5 ng/mL. 2  Men in the range of 50 to 59 years have normal PSA levels that are less than 3.5 ng/mL.lder male adults tend to have higher levels of PSA than younger men. The normal levels of PSA as per the age are listed below: 1  Men below the age of 50 years have normal PSA levels that are less than 2.5 ng/mL. 2  Men in the range of 50 to 59 years have normal PSA levels that are less than 3.5 ng/mL.