Calculating Age from Date of Birth

What would a good way be of calculating the Age of a person from a Date of Birth?

here, try this link:
http://www.phpbuilder.com/tips/item.php?id=653

its simpler than you think ;)

Thanks for your response.

I've got an easier way of doing it through MYSQL :)

Code:

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DATE_FORMAT(NOW(), '%Y') - DATE_FORMAT(dob, '%Y') - (DATE_FORMAT(NOW(), '00-%m-%d') < DATE_FORMAT(dob, '00-%m-%d')) AS age

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