This is absolutely wrong, you can definitely apply to any college you want at any age you want, I went to an Ivy League school and had classmates that were in their mid 20s/30s. I agree that going to college is absolutely the right advice -- but since you already have technical skills, I would study something other than CS, depending on your interests. You have the skills, and the breadth of a more diverse education will make you a more well-rounded human being than more CS.