Technology: Can Apple Stock Keep Rising?

I will never forget last October when Apple stock was just $20 and I told my Dad(I'm fifteen years old) to buy some. Of course he didn't buy it, but now he regrets it; the stock has quadrupled and was recently split 2-1 to $40. Though it has slowed down a bit, it is still rising. I am seriously considering buying some now, but will probably wait for the new ipod to come out.