That's exactly my situation with my mom - she never says she needs anything but her knees were killing her after walking her garden for hours. I bought her a knee massager last Christmas and she basically cried happy tears the first time she used it. The heat plus vibration thing is weirdly powerful, like instant relief without pills. She uses it every evening now and actually told me it's the first gift she's kept and used daily. I picked mine from knee massager because they had the original model with a year warranty and real heat therapy, not just vibration. For someone who doubts they need help, giving them comfort they can feel immediately is huge.