Take a look at this, it's a testament to "70 year old girl power ". The moral of this story has to be - never, never, never underestimate the "swinging sixties" generation.
Another story I liked was the one about a little girl who put a message in a bottle. A boy called Richard found it and sent her a postcard to which she never responded. Some years later, while clearing out her loft, she found the postcard and realised that it had been sent by her husband who she had met by chance in a sandwich shop in Beverley, Yorkshire. I think this has to be a case of extreme serendipity!