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Since if you do not renew your 1st class, it simply turns into a 2nd class, and eventually a 3rd class over time. Like above, peace of mind
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This is an often confused point...
After getting a first class medical...it is still a first class medical for however long the medical is valid for...
If you are under the age of 40...the medical is good for 36 calendar months.
If you are over the age of 40...the medical is good for 24 calendar months.
The medical remains a "first class medical" but first, second, and third class privilages can be used for the first six months...then second and third class privilages can be used for six more months (a total of 12 months)...then only third class privilages for the remaining time, depending on age.
The point is...the privilages expire...not the class of the medical.