100 days to Ironman

Today it is 100 days to "Great-grandpa goes Iron", the Haugesund Ironman 70.3, 1.900 m swim, 90 km bicycle and 21.1 km (half marathon) running. I am beginning to sweat already. My first Ironman ever, and I am 72. Will I make it? Will I survive? I know I can do the swim, bike and run distances separately (with days of recovery in between), but do it subsequently within 8,5 hours...? Well, if Daphne Belt from UK, at age 80 (she will participate in this event) can do it, so can I .... or...?