Automatic group based on age

[kevcj]

1. - My site has no adult content, so its ok if <18 sign up.

2. - Members less then 13 are not allowed to register.

4. - When registering, members have to enter their birthdate.

5. - Everyone between 14 - 18 years of age that registers, how can I put them into a "Youth" group automatically?

6. When a member turns 18, how can they be moved to a full member?

The "Youth" group has already been created and permissions tested. I just do not want to go through thousands of members checking birthdates.

This same question was posted on vbulletin.com, and I was referred here - http://www.vbulletin.com/forum/showthread.php?t=268130


============EDIT==============

Would it be possible to do this with a scheduled task that ran at midnight? Something that would check the birthday and compare it to the current date. If the result was < 18, user gets moved to youth group. If the results was >18, if in youth group, member gets moved to full member.