I started to learn HTML in 7th grade. I found a book in our library called "How to Make Web Pages." Before then I had thought that the internet made pages.

Though once I found out that any one could make an HTML page I was instantly hooked. I've read many books. I started with small basic books and built my way up. I remember printing out an HTML tutorial that was about 45 pages long. This for me was a long time ago. Now I'm 20 years old and im running a business doing the same thing I started when I was in 7th grade.
When it comes to computers you can learn anything. It doesn't matter who you are. I think I have proven that to my self time and time again.
I started to teach my self php a few years back. I remember writing a loop that would count from 1 to infinity. I thought this was the neatest thing because the page would steadily get taller and taller. Depending on what you want to learn, it will take some time. If you stick with it and perfect your skills then you can do anything.
If you want to start coding, take your first step and read over some of the tutorials on this site
http://www.w3schools.com/. If you are able to sit down read a tutorial and practice the syntax then you shouldn't have a problem learning..
HTH