I would argue that it has been the other way around.
In order to protect the over 80's and vulnerable from an illness with a 99% survival rate we have
Caused a massive upsurge in mental health problems amongst the young
Tanked the economy
Increased the rate of suicide in younger people
Tanked peoples businesses
Increased the rate of inflation to the point where having the heating on is no longer affordable for a great many people
Taken two years away from children which will have a massive impact on their education and social skills
Made work from home normal thereby isolating people
Increased rates of child abuse and domestic abuse as people couldnt escape.
Increase in cancer and other major illness deaths as people couldnt get treatment
Made a phone gp appointment 'the norm' meaning people are either not bothering, being misdiagnosed or going to a&e for stuff which should be dealt with by doctors if anyone could actually see one
Fractured families
We did that - us younger people stayed at home to protect the elderly but at great personal cost. We can do it no more. If people want to shut themselves away forever then that is their choice (my 75 year old inlaws have chosen this - while they wont catch covid their life is bloody dismal as they never leave the house, still disinfect their shopping and wont see their grandchildren due to fear).
It isnt that the lives of the over 70's are expendable - it is that the lives of the young should not be sacrificed any longer.