Can I release a new App for iPad 1, as of 2017? I have downloaded old versions of Xcode and macOS so I could develop and test an app on my old 1st-gen iPad device.

I wonder if I can submit a new app which runs on iPad 1 (iOS 5)
to Apple App Store as of 2017?
32-bit apps will be rejected, but that's not the whole story. Providing the app supports 64-bit, you can provide a 32-bit version alongside in the same app bundle. This way there is a 64-bit version for newer devices/iOS (iOS 11 removes 32-bit app support), but also a 32-bit version for older devices.

To add 32-bit and 64-bit support to your app bundle in Xcode, you need:


to target iOS 5.1.1. Targeting earlier versions of iOS doesn't support the combined app bundles. Later versions of iOS aren't supported on the iPad 1.
a version of Xcode which is able to target this iOS and also provide the combined bundle functionality, such as Xcode 5.0.2 or 5.0.3.
to change your project to build both 32-bit and 64-bit. In your project build settings, change Architectures to ‘Standard Architectures (including 64-bit)’.


You can then build your app to support 32-bit and 64-bit which will successfully submit to iTunes Connect.