Easy Peasy: Just off your playmates from Boyz Boyz Boyz - in many cases you won't have to worry about under 40 never mind underage and if you're lucky their ID card may be the OAP discount one which gets you 10% off at 7-11.

(The phone lines to 7-11's all over Thailand will be red-hot today with SGT members asking for details of their discount card - I apologise to the staff in advance )