You haven't been getting those "past due" notices?

Both as in if one goes replace both. Hard to tell the "normal" lifespan of
the timing set or water pump. You could try to start it one morning and it
could jump time with no warning. That's happened on a couple high mileage
beaters I've owned. Some motors like the old Dodge 318 you needed to
replace the timing set before 100K. Had a Dodge Dakota with a V6 that you
could actually hear the timing chain chatter at an idle with 90K on it.
Owned a Lincoln Mark IV with a 460 that slipped out of time at 130K with
no warning. If you're lucky it will jump time when you're trying to start
it otherwise if running it will bend and break stuff like valves, pushrods
etc.. If you have the money, the skill, and some leisure time, I would
change the pump and the timing set and belts at 190K.