I first watched a few of the episodes of DBZ when I was around 7 years old, when I was 12, I started to watch from the beginning i.e. Dragon Ball. I really was getting deep into the series. I finished Dragon ball in around 3 weeks or so because I found it to be so interesting, just after finishing Dragon Ball I started watching DBZ, it took a wee bit more time than Dragon Ball to finish, around a week or so more, but I promise you it was definitely worth it.I'm 13 now as of November 22nd, 2017 and I am watching Dragon Ball Super; It is just as awesome as the other 2 series.I would definitely recommend watching it if you are in the age group of 7 to 16 or even more.