Dominy is still alive per this link, Guillet was alive in 2004 per this and there's no evidence of death and the Italian Wikipedia says he's alive, so I guess we'll see if he's still around on his 100th birthday, White is alive per the first reference on his page. I couldn't find anything for Keppel, Campbell, Gagnon, Leboe, O'Keefe, Tucker or Houghton. I will added Dominy, Gullet and White in a moment. Other potential 1909 centenaries can be found on my . Cheers,    