Ashley, my son is 14 and was diagnosed with Dent at about 11 (?). We went about 5 years before that with an incorrect diagnosis, and treatments for that diagnosis that weren't working. From what I can gather in talking to different doctors and doing some research, Dent can present in a wide variety of ways and symptoms look quite different from kid to kid, especially in the US. I think, in Japan, where it's more common, the presentation is more recognizable. So stories from others will be encouraging and supportive, but might not tell you what to expect.
I know that my son was diagnosed by way of a genetic test, and we were told that Mason had a mutation at the ClC-5 gene, but that it was the 20th (!) mutation they'd found. A little research told us that they don't yet know which of the mutations match to which of the symptom-sets... so we don't know yet which long term prognosis we can expect for Mason.
Read a little bit on this forum, though, and keep asking questions and talking to folks. It's an interesting group of people!