The age helps a bit, but every case is different. If you can, locate a pediatric urologist; things with kids are just very different than with adults.
Depending on whether any pain is present, the rate of urinary infections, etc., those things will affect whether the docs advise treating soon or waiting a few years. As mentioned, a lot of cases just sort themselves out as the body grows and the organs take on their final form and position.
And some additional tests might indicate whether there is some structural problem with the ureter-bladder path that might benefit from surgery or other intervention.
It's just impossible to make any general assumptions. It is, however, probably safe to assume that there is not yet any severe permanent damage to the kidney, as long as the blood test numbers look good, and urinary infections are not very frequent or hard to treat.
Talk to the doc in detail for more specifics, since the local doc has all the relevant test results.
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