Typically medicals expire after 1 year but right now there are temporary policies in place so, it can depend on whether or not they are in Canada and have not left for long periods since their last medical. Agents have some discretion to order new medicals but generally they are adhering to the following policy:
In-Canada applicants
If you completed an IME within 5 years of submitting your new application, include the IME number (or the unique medical identifier number) from your previous exam in your current application.
You may be exempt from completing another IME if you meet all of these conditions:
- You applied, or are applying, for either permanent residence or temporary residence.
- You already live in Canada.
- You completed your previous IME in the last 5 years.
- Your previous IME indicated a low risk or no risk to public health or public safety.
If the above applies to your dependents, you may want to resubmit their original medicals with a letter stating that they have not left Canada (if that's the case), and you may want to offer that you will provide new medicals for them if still required. Otherwise, get new medicals for your dependents.