In the event of war, our country should only deploy those in their 20s and 30s

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I am absolutely against deploying people in their 40s and 50s like in Ukraine,
and given our country's sentiment, it would be absolutely impossible anyway.
From the start, active-duty soldiers are mainly composed of those in their early to mid-20s,
and the reserve forces are composed of those in their mid-20s to mid-30s,
so if things follow their natural course, deployment will naturally focus on those in their 20s and 30s.
Those aged 40 and above should just focus on their livelihoods, take good care of their families, and pay their defense taxes properly.