Chair yoga for knees that click. Has anyone tried it after 60?

My knees have started making a sound when I climb the stairs. The orthopaedic doctor said it is age-related wear and told me to keep walking but avoid squatting on the floor, which is difficult in a house where we still eat sitting down on some days. A lady in my walking group showed me some chair yoga videos. Stretching and simple movements while sitting. It looks gentle enough, but I do not want to do something wrong and make it worse. Has anyone here in their 60s tried it? Did it help with the stiffness in the mornings? And is there a teacher in Coimbatore who does classes for our age?