Correct alignment of your joints is important at any stage of your training, but even more so as we get older. It is often taught that we should push our knees out to the side, supposedly for stability. However, this puts lateral pressure on your knee joints, which will damage them over time! These teachings also fail to take full advantage of the body’s natural power line for pushing forward, losing power in all of your techniques. So learning the correct alignments will make your stances more comfortable, more effective and help take the pressure of any damaged joints.
See the video below for a full explanation: