Sir Alex Ferguson at 70: The changing face of Manchester United boss

Then and now… The changing face of Manchester United boss Sir Alex Ferguson

Manchester United manager Sir Alex Ferguson celebrates his 70th birthday on Saturday and, as these pictures show, he still has as much enthusiasm for the game now as he did managing St Mirren back in the mid-1970s.

The pictures are separated by decades, and offer a true illustration of the extraordinary longevity of the Scot.

Sir Alex Ferguson pictured when manager of St Mirren

Still enjoying his work: United boss Ferguson during training at Carrington on Friday