Originally Posted by
BuildingMyBento
I'm nowhere near senior citizen-age, but it's a fair point. (You bring up a good suggestion, though...can one get the Clipper card at SFO - e.g. on a layover - without going to the BART station?)
I believe you'd have to go outside of security to the either SFO BART station (which is attached to the International terminal departures level near the G gate side) or at one of the SFO Information kiosks in Terminals 1/2/3 on the arrivals levels. All these options are outside security though. If you have a long enough layover to re-clear security, you could probably do it.