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Yes our modern world does not make good use of grandparents. Given enough time you might expect that the cost of carrying elderly relatives is enough to select for quick dying grandparents. It might also select for healthy long lived grandparents who are not a burden. Probably both will be selected for in parallel .

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> our modern world does not make good use of grandparents

Senior citizens today probably have more power (and productivity) than they ever have.

Distracting grandkids with stories, or showing them how to do things is a superpower.

Grandparents used to be younger, too. Women used to have kids before 20, often at 15. You could be a grandparent at 30.

But even old and infirm, still stories could be told, and caring for grandma was distracting for kids too.

There were a lot more kids too. Most women gave birth yearly, and yes more died, but there were still more.

Keeping those kids busy was a plus. Training them vital.

The cost doesn’t affect the survival of the descendants though. It has to to affect the gene pool.

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