test monkey, from what I have read, 5mg/ed would be way to high for someone that young, unless it was prescribed for parkinsons or alzheimers. Doses for life extension/libido purposes are much smaller , like under 10 mg per week. Some people take 1 mg/ed , some take 2.5 e3d, some may take 5mg twice a week, those seem to be the dosages I have seen for life extension/libido purposes. Dr. Ward Dean has a chart in his book Smart Drugs II (I think) concerning dosages. The problem when dosages exceed 20 mg/week is at that point, deprenyl becomes not only a MAO-B inhibitor, but also a MAO-A inhibitor. At that point it becomes very dangerous with certain other medicines and maybe even some B vitamins (thyamine I think) & may cause the "cheese effect".