Welcome Wisconsinner.
If indeed you have CMT no one not even a doctor can predict how bad you will get. DNA blood testing is very expensive.
http://athenadiagnostics.com/ does it. There is a number you can call for more information.
Even though no one in your family has any symptoms that does not mean that they do not have CMT. Symptoms of CMT can be evident when you are old, young, or inbetween. Or symptoms might never be that evident. Or people can be misdiagnosed with something else. It happens still today. Symptoms vary greatly even within the same family. There are many, many types of CMT as well.
Hopefully, you will find an answer.