To conceive seed (ei katabolhn spermato). For deposit of seed. See Acts 4:3 for katabolh. Past age (para kairon hlikia). Beyond (para with the accusative) the season of age. Since she counted him faithful who had promised (epei piston hghsato ton epaggeilamenon). Sarah herself (auth--Sarra). Even Sarah, old as she was, believed God who had promised. Hence she received power.