in your age usually there is problem in climbing stairs, if you are getting knee pain ,first do knee strengthening exercises, stop climbing otherwise not to worry

Great ! Climbing stairs is a great form of exercise to your knees and also is an aerobic workout. If you don't have pain ,and at your age it should not be a problem. in people having arthritis in the knee or any kind of patellofemoral(knee cap) disorder,then we advice them not to do activities that cause pain or create increase in pressure in the joint. Hope I have answered your question