As to the CRA, you can stop contributing to the CPP if you are at least 65 and no more than70 years old. You can be following to this website for the request to stop in here: How do you stop contributing to the CPP?
or
You can deduct the contribution on employee income at Line 22215 like this page guide: Line 22215 – Deduction for CPP or QPP enhanced contributions on employment income
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