] "We're finding that there is a smaller volume, which
] would mean there would be fewer numbers of sperm," she
] said. "And also that the sperm get slower and less aimed
] at the goal -- they're not swimming directly to the egg."

Seems to coincide with men in general as they get older.. they act like their sperm, "slower and less aimed at the goal"

Study: Men have biological clocks, too