Hi, I'm 68 and just finished W5D3. I was so scared last night that I couldn't fall asleep and then I just yelled at myself and decided that I will have no judgement. Just do the best I can. Well I did it. Ran the 20 minutes with no problems, so excited... I run a bit faster than a turtle but I figure that I'll work on the speed after I build up my endurance. On to W6.