What minimum iOS and Android version would you support for an app v1?

Apple is now nudging people still on iOS 26 to move to iOS 27, and the 27.2 betas are already out. Every cycle like this makes me rethink the minimum OS question for a first release. I've found that supporting only the last two major versions keeps testing sane and lets you use newer APIs without workarounds. On Android it's messier, since a lot of real users sit on older devices for years, especially outside the US. If you're shipping a v1 on both platforms soon, where are you drawing the line? Do you check your target audience's device data first, or just pick a floor and adjust after launch?