What are the 5 oldest golf open championships?

The five oldest Golf open championships are: the Open Championship, first held in 1860 in Scotland; the U.S. Open, established in 1895; the Amateur Championship, which began in 1885; the Canadian Open, first played in 1904; and the Australian Open, inaugurated in 1904 as well. Each of these tournaments has contributed significantly to the history and development of professional golf.