Dominy is still alive per this link Guillet was alive in  per this and theres no evidence of death and the Italian Wikipedia says hes alive so I guess well see if hes still around on his th birthday White is alive per the first reference on his page I couldnt find anything for Keppel Campbell Gagnon Leboe OKeefe Tucker or Houghton I will added Dominy Gullet and White in a moment Other potential  centenaries can be found on my  Cheers