At what age do most patients get mg?

MG? By mg, could you mean myasthenia gravis? A neurologist is a medical specialist who can help with this condition, if that is what you mean by mg.
MG. Myasthenia gravis occurs in all ethnic groups and both sexes. It most commonly affects women under 40 and people from 50 to 70 years old of either sex, but it has been known to occur at any age.