How to Run With Statistics

There is a challenge out there of running the same number of marathons as you are old. So, a 39 year old man is challenged to run 39 marathons. My friend, at one point, had done that. But once he got married he stopped running entirely. Long ago, I gave up on that idea. I’ve only run three marathons (126.6km) in my life. (Four if you count the DisneyWorld Goofy.) I did contemplate trying to do the same with ultramarathons, but that would probably be too hard on my body to do that safely.
I have since noticed something though.
I am, at present, 39 years old. 39 marathons is 1645.8km. 40 marathons is 1688km.
The page that keeps track of all ultras I have ever run says that I have run 1596.268km total distance.
If I added the marathons I’ve done, that comes to 1722.868km. But, that seems silly. It’s just a marathon. And let’s be reasonable; the two 50km can barely qualify as ultras.
So, I’m at 1496.268km.
Iron Horse would put me over. Easily.

Then I would just have to worry about getting to 40 marathons of distance in ultras for next year.