The bus-pass approacheth

As you will appreciate, my overt maturity leads to my having few problems in purchasing alcoholic items at supermarket check-outs. For the first time ever, however, I recently encountered the flip-side of this, and I'm undecided as to whether or not I am happy with the situation. Over the summer I attended (with Mrs RCB and a friend in his 70s) a computer fair at Ashton Gate, the home ground of Bristol City Football Club. Our friend secured our admission, gaining entry for me - without my complicity, you understand - at the concessionary OAP rate. I didn't know whether to be pleased at having got in at the lesser rate, or annoyed at the ticket seller for imagining someone of my youthful appearance to be of pensionable age. I decided that to say nothing would be the better course of action. I'm now wondering whether there are other situations in which I could perhaps turn my apparent decrepitude to my advantage...