Square to square method

Recently I found this guy, Doug Tewell on the internet. What he says makes a lot of sense. When we were in our 20's we were young and nimble enough to do a full golf swing. After a few operations to fix our knees, hips and some other body parts, this method is no longer suitable for golfers over 60 years old. He suggested that perhaps we should be considering changing over to a 3/4 square to square swing: http://fast.squaretosquaremethod.com/get/the-bundle?utm_source=et-dt&utm_medium=email&utm_content=dt-8myth-50&utm_campaign=dt-8myth