VIP emails being deleted I have searched online but not found the answer to this problem.

For some reason, the emails in VIP folders only remain in the folder for 2 weeks and then they are gone. The oldest emails in the VIP folders are from June 16.

Is there a setting in Mac Mail for when these emails in the VIP folders are deleted?

Thank you for your assistance.
Go to Preferences > Rules. See if any rule is deleting VIP messages.

If any rules rules are deleting VIP messages, Just delete Them.