Its worth checking the Apple website to see what models can receive security and operating upgrades. It may not be important to you but STMBO in our hose does all our banking on her Ipad so it has to have the upgrades. Mine less so.
She also has just been diagnosed that she has to have hearing aids. The latest upgrade ISO 18 includes new technology that turns you airpods into hearing aids. Worth looking into what is important to you and which model supplies it