Hi there...this is my 7th week of training { I'm 60 on may 2nd } and have been building up slowly from a couple of 4-5 milers a week , increasing to 3x 5 milers during the week plus 1 or 2 8, 10 or 12 milers at the weekends. This weekend I will do a 10 and a 15 miler as well as the couple of shorter ones in the week. I live on Exmoor so walk a lot of hills and quite honestly feel ready to go tomorrow even tho I'm not due to leave for another 8 weeks! I started training early to iron out any foot problems as well as strengthening my back as its a bit ' dodgy '- but having said that, wearing my rucksack really helps- it only feels dodgy when I take it off now ! Get your back pack on as soon as you can, even without much in it as it gives you better posture from the word go.
Who knows, I may see you there......
good luck
Suzie