elkcrazy,
It's probably smart to do a bear hunt first--or for that matter, a sheep hunt--as Cape buffalo hunts tend to be easier physically. (On the negative side, wild Africa continues to shrink, due to the rapidly increasing human population.)
That doesn't mean Cape buffalo hunts can't be tough. When I hunted in Tanzania two years ago, one of my companions was in his mid-60's and ended up following a bull around for miles one very hot day, at first to get a shot at a herd, and then to put more bullets into the same buffalo. He became severely dehydrated and heat-stressed, and ended up in bed for three days of an expensive hunt while recovering.
But normally a buffalo hunt requires less physical work than a grizzly/brown bear hunt, making them more possible for older hunters.
Though I doubt I will hunt either of these species due to price, this is the rationale I would use for one over the other. Easier to write another check as you age than run up/down the hills when your older.
