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.
What is the normal PSA range for men? A normal PSA level in men is less than 4 nanograms per milliliter, according to WebMD. Because younger patients usually have smaller prostates, some studies suggest that an appropriate PSA level for a younger man is 2.5 nanograms per milliliter or less.