Can we use date_select as one observe_field

hi all,
i want to find out the age of a person in the simple registration form
without submitting the form.
we can use link_to_remote or submit_to_remote(…), but i don’t want
to use any link or button to link to the controller. Can we use
date_select as one observe_field or any other possibility to do this…

plz guide me to do this…

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