Yeah, but you're the one dying out.
Having a fairly modern smart device is ubiquitous for anyone under the age of thirty these days, and honestly, the scope of such devices is amazing. The capability window has, like for computers, grown – as they become more powerful, there's no reason why a phone several years old won't be perfectly functional. But there will be fewer people waving their twenty-year-old Nokia at you and humpfing about smartphones.
Phone updates these days are incremental, I only update every half-decade or so.