Exercising at 50 or 60?

Does exercise get scarier when we get older? Maybe, to some.
Then I see an older man running past me as I walk the neighborhood. He looks great, runs at a good pace, and, I imagine, has no fear of pushing his body.

The thought of working up to a run kind of scares me since I haven't run since I was in my 20's.

There's a program called Couch to 5K that combines walking and running/jogging to get a person ready to run a full 5K. Which I think is 2 or 3 miles? Yesterday I walked 2 miles through, up and around my neighborhood. Stupid me, I did it at 1 o'clock in the afternoon during the hottest part of the day. I really can't take the heat when I'm sitting still so by the time I got home I was kind of dizzy. But I did it! (There's a phone ap called Map My Walk that will track it for you.)

Today calls for rain so unless there's a break in the rain, I might just hit the weights today. I was reading Body for Life by Bill Phillips and one of the success stories was an older woman, 60+, who did the program. They showed her standing there in a bikini with an amazingly buff body. Made me think it was possible. A quick internet search found Bonnie Ave, champion body builder at age 60! So I believe there is hope.
Not sure if I'm ever going Couch to 5K but I am going to get off this couch.
Anyone else start an exercise program after 50? What's your story?
Come on! I need some inspiration!