I've taken Deprenyl on and off for years, IMO, you don't need to start Dopamine/Ganglia protection at age 24, but you can use it at 5-7.5 mgs once a week to inhibit MAO to increase Dopamine and PEA levels. Once a week is sufficent at that dose range to keep MAO-B and some A suppressed to increase focus, libido, general motivation and mood in most, not all, users. Once a week is what I do, chirpy fellow that I am, but that's probably more than necessary.Deprenyl is supposed to selectively inhibit MAO-B for up to 40 days per sufficent dose for that effect (~5-10mgs.)
If you want a nice stim kick, combine 5 -10mgs Deprenyl with Avant's H.E.A.T.; or a gram or two of Chocamine or a dose of AMP, crankin'.