Hi, Arabella,
Admitting one's age can be a funny old thing. I've just read a passage from Robert Graves' book "Goodbye to all That", in which he describes how half the soldiers in his regiment at The Front fibbed about their ages - 15-year-olds pretending to be 18, and fifty-somethings pretending to still be in their forties.
But I suppose wartime and genealogy are two entirely different matters. And yes, my mother and father's generation are beginning to drop by the wayside now, so like you I realise that time is of the essence if we're not to lose certain vital family facts before it's too late...
Keith