Ok, not as bad as the title sounds but...

I've been asked, by t'other half's niece, if I can DJ at her 13th birthday party in February. Now the last time I DJ'd to 13 year olds was at the end of the 80's when I worked in the Ice Rink in Bristol. Nowadays I won't touch anything less than a 40th birthday. So, my question is this... what the hell to play? Do 13 year old like cheese? Or is it just chart garbage, sorry, tunes?

Any help greatly appreciated. Thanks in advance!