I don't think i'm that old?!
i have no idea what that reference was to?!
kirsty, 18,19, 20 miles, I wouldn't worry, it's all much the same disatnce really, the biggest difference is in your mind. I've trained doing loads of 20+ runs, including marathons for marathons in the past, yet the last marathon I did I got my second best ever time and only did one 20 mile run, an 18 and a 17.
And if the snows really bad find a park, football pitch, old railway line...