LONDON, July 27, 2014 (AFP) - The 56-year-old, who won the Masters in 1985 and 1993, shot four rounds in the 60s to finish 18 under, and left Scotland's Colin Montgomerie a distant second on the way to his third win on Welsh soil.
The 13-shot winning advantage, in a major, eclipsed the previous mark of 12 held by American Hale Irwin at the 1997 Senior PGA Championship.
He now has 94 professional wins, including a Senior British Open win in 2010, the same season he won the Senior US Open.
Langer also won six Ryder Cups as a player and captained Europe to victory in 2004.
Canada's Rick Gibson, Barry Lane of England and American Tom Pernice Jnr finished in a tie for third on two under as only five players finished under par over 72 holes.