One of the beauties of the physical practice of yoga is that the poses support and sustain you no matter how old or young, or fit or frail, you come to your mat. As you age, your understanding of asana becomes more sophisticated. You move from working on the external alignment and mechanics of the pose to refining the inner actions to finally just being in the asana.
Yoga has never been alien to us. We have been doing it since we were a baby! Whether it is the Cat Stretch that strengthens the spine or the Wind-Relieving pose that boosts digestion, you will always find infants doing some form of yoga throughout the day. Yoga can be many things to many people.