I'm not that old—27, so, maybe—but I do the same thing. In-App Purchases signal to me that the game is likely to begin ransoming my pleasure as soon as I invest time into it. It's a very frustrating feeling.
There are too many things out there that don't do that to waste time on a computer game that plays mindgames.
EDIT: I should add the caveat that if it's clear about what the IAPs do—i.e. they're clear addons or a shareware model of an otherwise good game, rather than "this game will progress untolerably slowly unless you pay"—I'm not a stickler on principle. Without more information, though, the presence of IAP is a strong negative signal.
You're old enough to know better. The problem is that for younger kids, this kind of stuff is normal. There are even IAP for fully paid games on consoles/PC (are DLC considered IAP?). IAP are everywhere now.
There are too many things out there that don't do that to waste time on a computer game that plays mindgames.
EDIT: I should add the caveat that if it's clear about what the IAPs do—i.e. they're clear addons or a shareware model of an otherwise good game, rather than "this game will progress untolerably slowly unless you pay"—I'm not a stickler on principle. Without more information, though, the presence of IAP is a strong negative signal.