1. Proposed title of this feature request
Add maxAge field to MachineHealthChecks

2. What is the nature and description of the request?
Add maxAge field to MachineHealthChecks There is a pull request already opened for this [1].

[1] https://github.com/openshift/machine-api-operator/pull/843

3. Why does the customer need this? (List the business requirements here)
The customer has the process of deleting all the nodes in their OCP cluster running in GCP after 7 days. The reason they said they do this is because of the following.
It helps ensure applications are resilient to node or infrastructure failures
It helps ensure applications are resilient when we patch the underlying nodes

4. List any affected packages or components.
MachineHealthChecking