I truly believe that age isnt a limitation

there are so many examples where people started "later" in life

http://www.srichinmoyraces.org/us/tr...g/seventyyears

the one runner started in her fifties...

and i found this little blurb
Ottinger has not always been the healthy, dedicated marathon runner that he is today. Once an amateur boxing champion and a fast-pitch softball player, Ottinger found himself overweight and with a severely enlarged heart at age 53. His doctor warned that if he did not begin exercising, he wouldn’t live much longer. Motivated by his love for his family, Ottinger began to run. Since his health scare, Ottinger has completed a variety of impressive feats, including climbing the Andes Mountains, jogging along the Great Wall of China and beating an aggressive form of prostate cancer.


yes it might take longer for the body to adapt, but it isn't impossible..