Lodewicus Theodorus "Louis" Oosthuizen ( ; ] ; born 19 October 1982) is a South African professional golfer who won the 2010 Open Championship.
 He also holds the distinction of finishing runner-up in all four major championships: the 2012 Masters Tournament losing in a sudden death playoff, the 2015 U.S. Open, the 2015 Open Championship where he was defeated in a four-hole aggregate playoff, and the 2017 PGA Championship.
 He is the seventh golfer to accomplish this feat, joining Craig Wood, Jack Nicklaus, Arnold Palmer, Tom Watson, Greg Norman, and Phil Mickelson.
 His highest placing on the Official World Golf Ranking is fourth which he achieved in January 2013.
Ned Cosgrove (born  1858 ) was a Scottish professional golfer who played in the late 19th century.
 Cosgrove had two strong finishes in the Open Championship, both third place, in the 1880 Open Championship and again in the 1881 Open Championship.
 Bob Ferguson was the winner of both the 1880 and 1881 Open Championships.
David Anderson Sr. (1847 – 8 May 1912) was a Scottish professional golfer who played in the late 19th century.
 His brother Jamie won The Open Championship three times (1877–79).
 His son David Jr. was also a professional golfer.
 Anderson's best result in the Open Championship was 17th place in 1890.
David Kinnell (1879 – January 1951) was a Scottish professional golfer who played in the late 19th and early 20th century.
 Kinnell had two top-10 finishes in the Open Championship.
 His best performance came in the 1908 Open Championship when he finished tied for fifth place.
 He also had a good performance in the 1898 Open Championship, finishing in the sixth position.
James Kinnell (1876 – 22 April 1918) was a Scottish professional golfer who played in the late 19th and early 20th century.
 Kinnell had five top-10 finishes in the Open Championship.
 His best performance came in the 1905 Open Championship when he finished in fourth place.
 He served as the head professional at the Prestwick St Nicholas Golf Club in Prestwick, Scotland.
 His brother David, also a professional golfer, worked at the club as well.
Roberto De Vicenzo (14 April 1923 – 1 June 2017) was a professional golfer from Argentina.
 He won more than 230 tournaments worldwide in his career including eight on the PGA Tour and most famously the 1967 Open Championship.
John George Pulford (born 1873) was an English professional golfer.
 His skill on the links enabled him to place high on the leaderboard in several Open Championships.
 He finished tied for third in both the 1897 Open Championship and the 1907 Open Championship.
 He was fourth in the 1895 Open Championship and was tied for tenth place in the 1909 Open Championship.
Arthur Edwin Reid (16 September 1882 – ?)
 was an English professional golfer of Scottish descent.
 He won the 1905 Swiss Open and the 1918 Philadelphia Open Championship (tied with Pat Doyle).
 Reid also competed in The Open Championship and the U.S. Open.
 In the 1909 Open Championship he finished in 47th place and was tied in 37th place in the 1919 U.S. Open.
Thomas Francis Kerrigan (October 10, 1895 – May 6, 1964) was an American professional golfer who played in the early 20th century.
 Kerrigan's best performance in the Open Championship came in the 1921 Open Championship when after enduring an Atlantic voyage aboard the RMS "Aquitania" he quickly acclimated himself to the Open Championship course at St Andrews on arrival in Britain and finished in third place.
 He was a frequent competitor in the PGA Championship in which his best results were quarter-final losses (in match play) in 1916, 1922, and 1925.
The 1967 Open Championship was the 96th Open Championship, played from 12–15 July at Royal Liverpool Golf Club, Hoylake.
 Roberto De Vicenzo, 44, won his only major championship, two strokes ahead of runner-up and defending champion Jack Nicklaus.

Question: Professional Golfer from Argentina was how old when he won the 1967 Open Championship?
Answer: 44