At around age 23, the average person falls off what the researcher Jennifer Aaker calls ‘the humour cliff’: we start to laugh and smile less and less. The average 4-year-old laughs and smiles 300 times a day, the average 40-year-old — 300 times every 75 days..
Life gets increasingly miserable .
I'd also laugh more if all my worries were to eat and to play and to nap..