pardon my ignorance, but wouldn't any anzacs alive now would be ... pretty old?
Just about all of them would be dead. That doesn't mean it's not important to remember Gallipoli, the Anzacs, and the whole Bosporus campaign of 1915.
The Anzacs are one of the many reminders from WWI of the futility of war. Not only were hundreds of thousands from both sides killed and wounded, the whole campaign - which lasted just under a year, if you count from Feb., 1915 (when the navy arrived) to Jan. 1916 ( when the Austalian, French and other allied troops withdrew) - did not shorten the war one single day.