No single TV can claim to be the easiest to use as it depends on the individual using it. Some might find a specific tv easier to use than others.Secondly, prolonged usage makes that interface easier automatically; thus, if you’re looking for the easiest-to-use smart tv for the elderly. The easiest-to-use TV for them would be a TV with the same similar interface and similar features. For example, if they have been using an Alexa-compatible TV, it might be easier for them to get another TV that is Alexa-compatible.