When Does 'Grumpy' Begin? Try Age 52

The tipping point of being grumpy occurs at age 52, say Welsh researchers. That's when people are more likely to gripe than laugh, according to the University of Glamorgan study. "We laugh twice as much in our teens as we do in our fifties," one of the researchers tells the Telegraph. "And our findings suggest that it's all downhill from 52.”

And more so for men: Those in their 60s are four times grumpier than their female counterparts. The study also tracks a depressing stat on laughter: Infants laugh aloud 300 times a day, but the figure drops to six times for teens and four for 20-somethings. After a slight rise for 30-somethings (probably because they had babies), it continues a descent to 2.5 times a day for 60-year-olds.
(More aging stories.)