How high is an IQ of 169-170 for a 10 year old?

An IQ of 169-170 is quite high for a person of any age. A relevant fact to note here is that through your life, your IQ score is unlikely to change, or unlikely to change very much: the IQ stated is quite high, and you are likely to have it throughout your life.

However, if this is a website-given test, do not put too much credence to it. The best way to get a measure of your IQ is to have a consultation with a professional.