Consider this fact of modern life: Nearly all of the technological products that we buy and use are designed with planned obsolescence in mind. They are built specifically to fail after a relatively short period — one year, two, maybe five. If you doubt that, think about how often you have to replace your smartphone. Gadgets are designed to die.

The irony, however, is that the same Silicon Valley culture that produces these gadgets seems to be obsessed with living forever.

Today’s “life extension” movement includes venture capitalists like the tech billionaire Peter Thiel pouring money into anti-aging and life extension start-ups. (While the rumor that Mr. Thiel receives regular blood transfusions from 18-year olds turned out to be false, there is, of course, an actual company — Ambrosia Plasma — that provides young plasma infusions for $8,000 a liter.) And Google launched the biotech company Calico to increase its “understanding of the biology that controls lifespan,” and bolstered that goal by conducting research on the long-living naked mole rat, a species that shows little to no signs of aging.