age of empires conversion to 64 bit

You can always revert back to a macOS that supports 32-bit apps if that is the issue.

Revert your Mac to a previous macOS version - Apple Support

Or as an alternative you can run the older macOS in a Virtual Machine:

VirtulaBox

ParallelsDEsktop

vmFusion

It wil be necessary for the developer to issue a 64 bit version.