I've heard about oldsters in M&S before. It's quite a common occurrence, apparently. I wouldn't give M&S the time of day, so I'm just going on reports here.
Kitiekebab, I shall almost certainly manage on the 'pittance' that most of them get - because it's be more than I get now, and I'll get rent allowance, free prescriptions and free bus travel too.
And when I'm old, I'll shop in the early morning when it's quieter (Why shop at lunchtime, when it's busy and noisy and everyone moans at you? Why?), I'll say please and thank you to teenagers (because, you know, if you do, they often reciprocate), and I won't expect the world to revolve around me just because I've worked for a living all my adult life.