Not old enough: You might need to add a ratchet or automagic reversing gear so that it only rotates in one direction.
I beg to differ. Safety bicycles have the benefit of about 125 years of development and testing. Brushless electric drills, maybe 10 years. My various bicycles tend to last 20-30 years. My brush type drills, maybe 10 years of light use, or 2 years if I do serious drilling or loan them to the neighbors. I recently recycled two Black and Decker cordless (NiCd powered) drills because they were so worn out that they were not worth fixing. My guess is about 10 years old and the batteries were still functional. Extra credit to Skil(?) for selling a right angle grinder with non-replaceable brushes. Anyway, my bicycles are far more reliable and longer lasting than my power tools.