When training in the martial arts, you need to take your age into account.
It is a major factor.
If you are 40, it is unwise to undertake a system that relies upon strength, speed and fitness.
Tai chi favours the older student.
The subtle skills of the art require a mature, disciplined, patient mind.
You focus upon physics, the application of pressure, sensitivity, rhythm, timing, balance and intention.
Instead of wearing yourself out, you feel energised, relaxed and confident.
You have a low risk of injury in tai chi, although bumps and bruises will occur in a self defence class.