30 years. I am only in my 30s and most of my childhood was stolen by M.E. Before M.E., I had serious "warning signs". All the conditions were right for me to develop M.E. when the trigger(s) happened. The first 18 years, I pushed myself hard. Then I went through a stressful 2 years and finally went to get diagnosed, 20 years after onset. With years of practice, I am better at not pushing myself but I cannot seem to avoid stress.