The 18-month pilot program will be extended for another six months, transit officials said.
The Muni Senior/Disabled Pilot Pass, or "P" Pass, costs $26, which is $5 more than the regular monthly discount pass.
Transit officials said participation in the program has been low, which may be due to the fact that customers were required to pre-register for the pass and obtain a voucher book to buy the passes at three participating locations.
To make the "P" Pass more widely available, customers are no longer required to pre-register or acquire vouchers and the passes will be available at additional vending locations, according to transit officials.
One thousand passes will be available on a first come, first serve basis. Customers must present valid identification, which includes a government-issued ID for proof of age or the Regional Transit Connection card for seniors or people with disabilities.
The "P" Pass is not available on Clipper during the pilot program. If the extended pilot program is a success, transit officials said they will do away with the paper passes and the "P" Pass could be added to Clipper.