Restricted Access based on registration date

Hi, I set up the free Version of PMS for my mother in law who wanted to start charging a monthly fee for her blog posts. Everything is working wonderfully!!

However, she asked me if there is any possibility to restrict access based on registration date?

She is charging a monthly fee for her subscribers, and she thinks it would be unfair if new subscribers get access to all the content that previous subscribers had to pay for.

Can I set it up in a way that new subscribers only get access to restricted blog posts starting from their registration date and not all of the previous ones as well?

Thanks for your help, I couldn’t find any information on this in the Documentation.

The page I need help with: [log in to see the link]