Hi Sunday. One almost certainly won't be enough, even if it's good. Typically it takes around 20-30 featured Hubs before you'll be accepted.
However, you can reapply periodically, so feel free to try when you begin approaching 20! I didn't get in until I had at least 40 (much of my writing is entertainment-based, which tends to take longer to prove itself), but you could get in as early as 10 or 15. Best of luck.