As for how old it is, I found a hand-written copy among my grandfather's papers, along with other memorabilia from WW1. So guess it's older than some of the other quoted versions. Just 4 verses and no chorus. Some similarities in the 3rd verse with the one given by McGrath on 31.10.99.

Donoghue and McHugh came from Red Waterloo
And O'Neill and McPhail from the Rhine,
There was Ludd and McSpudd from the Land of tge Flood,
Mick Malone, Mike McGlone and O'Brien,
There was Mick McIntee and a big Portuguee
And Michael O'Dowd from Dover,
And a man from Turkestan by the name of Pat McCann
Was the skipper of The Irish Rover.