I'm wondering just how much I can make a calculated field that updates live?

Example is AGE.  If i am born in 1911, then I am 100 years old now.  But if I make a calculated field for a record, and that record is not updated for two years, it means that in 2013, it will still say I am 100.

This is a real pain.

Is there a work-around?  Mysql handles this type of thing beautifully.

Thanks,

David