livvylala,
i have never seen people being checked on the door at pacha for age. don't worry (although of course i can't condone it ;-)
otherwise nightlife is a bit quieter in october, but there are still quite a few bars open.
cafe del mar is open until november and the rock bar and several others in ibiza town stay open right through until november too.
the beaches will be gorgeous too - still hot and sunny but much quieter - as long as you are not after the manic clubbing of august, october is a really nice month to come!
apart from pacha only es paradis will be open. but km5, la diosa and hopefully ak morgana will be open all month
