There is no support for pinentry.

[Myridium]

In pass, the gpg-agent manages the secret associated with the GPG key. This may be the PIN to access a YubiKey, or the passphrase to a password-protected GPG identity file.

On the other hand, passage prompts for the password to the age private key every time it is needed. This program should either hand-off the secret-gathering to another program (like an age-plugin-... or ssh-agent or something) or it should support the use of a chosen pinentry program.

[FiloSottile]

Caching a passphrase is covered by #3. Caching the YubiKey PIN is going to be available through an upcoming age-plugin-yubikey-agent that uses https://github.com/FiloSottile/yubikey-agent. I have no plans to implement actual Pinentry support at the moment, as the UX is actually pretty poor on macOS and Windows.