An apparatus having an upper frame adapted to at least partially encircle a person and including a lower frame and two double scissor mechanisms for coupling the upper frame to the lower frame, wherein the distance between the upper frame and the lower frame can be varied by adjusting the double scissor mechanisms, and the walker is raised or lowered. Scissor lift assemblies housed in the lower frame, each powered by a motor or compressor, raise and lower each double scissor mechanism.