Fer fuck's sake, I'm only 37. And realistically, I've been taking them on and off since my teens.
I'm up to 4. 2 twice a day, and perhaps add another 2 if I've eaten or drank something that perturbs my stomach.
I have a wicked prescription for it, since I was assessed with H-pylori a couple of years ago.
Can't imagine how many I'd have to take if it was "off-the-shelf" stuff.