SamTrans is phasing out paper monthly passes. The December 2011 pass is the last paper pass being sold. Starting with the January 2012 Monthly Pass, it will be available only on the Clipper card. Youth and Senior Monthly Pass customers who need to obtain a Youth or Senior Clipper card must fill out an application and bring it with proof-of-age to any of the sign-up event locations or to the SamTrans office in San Carlos Clipper cards will be mailed to youth customers within 21 business days; Senior cards will be issued at the time of visit.
More details, along with a downloadable application, dates of sign-up events and other information at the SamTrans website.