I know that in a In PaaS:shared-webserver service a user could have the OS of its server environment release_upgraded in 8 or 12 years or so ! For example, I host a few sites on a particular host that uses a very old version of CentOS (from about 2007).
I never used a PaaS:VPS service (like AWS/MSA/GCP) and I wonder if they have a different standard of doing OS release_upgrades; for example, I wonder if due to utilization of OS deployment tools like Vagrant, it might it be say per each new release (say, each 2 years) instead?
How frequently do PaaS:VPS agencies upgrade OS_release in comparison to PaaS:shared-webserver?