Isn't Taiji just for old people?
Absolutely not. In fact people who begin practicing earlier benefit more from taiji than those who begin at more advanced stages in life. One of the main reasons for this is that the body adapts to new stresses more quickly at younger ages. Many of the better masters we see tend to be quite old, this is true, but they didn't just begin. Many of the worlds top Taiji masters have been training the art since early childhood, a lifetime of practice got them to the stage they are at, They probably were even quite skillful at very young ages, but they just happen to be a little more experienced and much wiser at the older ages, so their skill is that much greater.