Hi sidpar,I'm not sure what your mean with "B1G1" passes. If you're referring to the 2-for-1 offer for Swiss (Flexi) Passes, then yes, anyone of age 16 and older may use that pass. Details and purchase links for your country of residence can be found here.
web browser that
supports HTML5 video
All you need to know about traveling by train, bus or car in Switzerland.
Hand picked Swiss hotels and other accommodations are right here.