Can you code when you're old?

Your brain starts shrinking at age 25. Can you be 40 and still program with your inadequate and declining faculties?

25 is not old, 35 is old, I started when I was 35 and my brain was not as fresh and agile to take in new infomration

its easier to be self taught when youre young, when your old you are going to have to take classes to learn