My
DH has ran 3 local 1/2 marathons. And did his first marathon on his 38th birthday in January. He had a great time. It was at DisneyWorld and is called "The Happiest Marathon on Earth" (you Disney lovers will find the humor in that)
He's running it again in January and after that wants to either do London or Tokyo.
He loves his running time. It's "Me" time for him. It's quiet and out of the house. And it keeps him from looking like the other almost 40 yr old men that he sees (ie. no beer gut)
He ran 6 miles yesterday and is going to get is putting in a few more miles today.