Somewhat. Programming is just writing step-by-step instructions for computers, which is something that little kids can do. Where small children will run into problems is anything involving abstract reasoning, since those faculties don't develop until around age 12. So while kids could easily handle something like (+ 1 2), they would struggle with:

    
(define (add x y)
    (+ x y))

  

So just be sure to keep that in mind while showing them stuff and it should go fine.