you can run a marathon

One month ago, the 2nd of April I runned the IV Maraton Martin Fiz in Vitoria-Gasteiz. I finished the race in a time of 4:25:48, the limit time was 4:30:00, so i finished in the time. My objetive for the race was finishing it in time.
why did i run a Marathon??? Because since years, I had in mind to run a Marathon. I am not a runner, but running 42 km toke my attention. I want to demonstrate to myself that i was capable.
My trainee was ten sessions in 3 months, less that once a week, each session i run 15km. I do my preparation like this because i wanted to force myself during the race to achieve the goal. Go beyond to my limits and suffer to get it done.
After my experience I believe that anyone who wants can run a marathon. Of course, with some training sessions, if possible more preparation than I did.