Older people helping to make more products/services is a downside to society at large?
I would understand if “working” was a competition for limited resources. But if it is, in fact, a value generating activity, how does it harm society at large?
e.g. Having more doctors work until later, if they are capable, is not a net positive for our society’s ability to provide healthcare?
Now advances in tech may continue to increase demand for workers elsewhere, once training and workers catch up. Or maybe not as much as roles are lost.
I hope you're never old with people around you that think the same as you think now. Either you can do the job or not.
As to immigration and women and others, it can be argued the end game of every able bodied adult working until death is quite dark -- even if it begins with most of them finding some enjoyment in it.
When I'm old I hope my family encourages me to find joy and meaning outside employment, once the finances have been secured for retirement.
Posted a similar request elsewhere, but I think you need to substantiate this claim.
Furthermore, if you're claiming that tech destroys jobs in the general economy, then the consistent position would be that young or old should stop working in tech, not just older people. But the research I've seen shows that tech jobs generate non-tech jobs on net.