Minisign and Age entirely dodge the actually hardest problem with humans using cryptography, that PGP puts front and center: identity and public key discovery. You cannot just skip these!
If a human focused cryptography tool gives a user no way to know if they are encrypting to the correct public key of someone else, or no way to distinguish a real signature from one of an impersonator, then the tools failed to do their job.
Age is maybe useful for personal encryption use cases, but it is no way a replacement for all encryption use cases of PGP, especially between humans. Let alone signing and authentication which would be a prerequisite to do this safely.
If a human focused cryptography tool gives a user no way to know if they are encrypting to the correct public key of someone else, or no way to distinguish a real signature from one of an impersonator, then the tools failed to do their job.
Age is maybe useful for personal encryption use cases, but it is no way a replacement for all encryption use cases of PGP, especially between humans. Let alone signing and authentication which would be a prerequisite to do this safely.