As Big John and others suggest, perfect position is a bit of a moving target. A perfect fit for my 30-something self would send a guy like me to a chiropractor. In fact it did.
When I bought a new bike, I told the young whippersnapper, "set this up like you would for your father." He did exactly that--with handlebars as high as the seat and a shorter stem so I wouldn't be stretched out as much as in the past. We agreed that I would try the bike out for a few weeks and come back for additional adjustments, if needed. That approach served me well.
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"Light it up, Popo." --Levi Leipheimer