The City bus (the blue color bus) is a bargain at 1.50 euro for an all day pass.   You may be  "kindly" asked "senior"?"  If so, and the cost is s .80 for a day pass. Take the bus, do the circular route.  Hopp n and off as you please and spentd a lovely afternoon seeing sights.

 Here are the latest bus timetables for Gibraltar for 2013.