A collapsible wheeled walker with two side frames and two height adjustable upper body supports. The apparatus includes a seat that is slidably attached to the two side frames and is movable between a front position to facilitate an ample walking space inside the frames and a rear position for a user to sit. The apparatus may include an X-folder that facilitates collapsing the walker to a small footprint for storage and transportation. It may also include a left forearm gutter and a right forearm gutter as part of the upper body supports that give the user an upright walking posture for health benefits.