People Affected. Usually, only people who are over 60 years old are affected by essential tremor. There are some cases of it happening to younger folks though. One example of this can be seen in those who suffer from early onset Parkinson’s disease, which can begin in people who are in their early 30’s. Multiple sclerosis patients younger than this can get it too. And so can people who take certain types of medications that affect their brain chemistry, such as antidepressants.