A walker is disclosed providing motorized height adjustment and having U-shaped lower and upper frames, each with left and right members. Both the left and right lower and upper member front ends mutually connect. Both frames are horizontally oriented, with the upper frame generally above the lower frame, which includes wheels. Generally vertical left and right double scissor mechanisms interposed between the upper and lower members maintain the alignment of the upper and lower frames. At least one powered, user-controllable linear actuator with a pneumatic lift spring and position memory raises and lowers the upper frame. The upper frame has three positions: the raised position, ready for a person to use the lowered position, ready for a person to sit or stand, and collapsed position for storage and transportation. A width adjustment mechanism spreads or contracts the rear ends of the members to best fit any size person.
