You're never too old to do Pilates! I have taught students up to 70 years old and they have all benefited from increased strength and better mobility
Pilates is a particularly good form of exercise if you have a long standing injury: exercises can be selected and adapted to suit you and your body. For new acute injuries you should always consult your medical practitioner before taking up any exercise.
I am trained in Pilates for pregnancy and the postnatal period. Exercises are built up safely and carefully.
I am trained in Pilates for osteoporosis and osteopoenia. Carefully selected Pilates exercises can be very beneficial for improving and maintaining posture, developing good balance, and maintaining bone density.
Just wear comfortable clothing in which you can move easily, for example, t-shirt and leggings. It's a good idea to wear socks because your feet will need to slide.
You don't have to practice between sessions, but if you want to I can give guidance.