I have a bit of a problem with this picturing people malarkey.
For a start I don't see any of us as 'old'. So many posters are witty, funny well read, kind, capable, wise etc and I can only imagine lots of lively women I'd probably enjoy chatting and laughing with over a cuppa.
Going on the news and politics threads more often than anywhere else I suppose (fool that I am) I have a picture in my head of some of the Grans I may be at loggerheads with.
They are all very strident, upright and slightly imperious. I expect they are all doctor's receptionists - or leaders of WI groups, circa 1950, or failing that, storm troopers. 
I jest.
Me? I am a dead ringer for a young Sophia Loren. Not.