Men past a certain age are advised to stop and smell the roses, as well adhere to any number of other time-honored clichés, each one more boring than the last. Really, though, men on the dark side of 65 should take it easy because no matter how macho they pretend to be, the old carcass is wearing out. Take it from one who knows.   Pretending I was going on 25, I worked out in the sun until I started hallucinating. As it turned out the, the hallucination was a hibiscus blossom half hidden by shadows.   When one can’t experience a real hallucination, a hibiscus blossom seen in a certain light is the next best thing.   I’m told the common name for this flower in the country gardens of the USA is Rose of Sharon.