Can you get back year later deleted messages

If you were using a mobile device OS version prior to 16, were using iCloud with Messages and deleted them, they are gone permanently. If you were not using iCloud with messages you may be able to restore them from a backup but only if you are prepared to revert the entire contents of your device back to the time when the backup was made. See this Apple Recommended 2021 post by ASC contributor Chris0107: trying to ser if theres a way i can recov… - Apple Community

With iOS 16 you can recover messages using a different method but only for messages deleted in the last 30 days.