Laughter To Age Ratio

I came across this curious fact the other day and it struck a chord. There's a girl at work who laughs almost every time she speaks. Quite frequently she laughs so hard she cries... I wonder if she has "the laughter gene", if her family sit around chuckling together at night? She makes the rest of the people in our quiet office (me included!) seem very sedate.

Anyway, here's my curious fact about laughter:

"Six-year-olds laugh an average of 300 times a day. Adults laugh 15 to 100 times a day."

Is the world more entertaining to a six year old? Do they have more time to notice the funny stuff? Is there a chemical change that takes place as we get older that evens out our "laughter-bility"? Or do kids just eat way more sugar than the grown ups and, happy by-product, get more giggles as well?

If you can answer any of my questions I'd love to hear from you!

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