question: Good Morning  You are speaking to Brenda Stonehouse .... kidney donar for my brother 3 years back .... still extremely fit and healty ..... how far can I run .... I want to do a marathon or the Two Oceans which is 56 km ..... am I allowed to do it??  My age .....45 ..... 02/10/1965 .......   Thanks  YYYY@YYYY