Never mind the decline in improvement, I think we're going to see a sudden sharp drop very soon. It may be hidden by the long-lived generation before, but the baby boomers have eaten, drunk, and medicated themselves into oblivion compared to their parents. And who knows what's to come for the next generation, with an increasing wealth divide and heck knows what else.
Every time I join them it's the same "he seemed so healthy/ it was so unexpected/ she was gone so quickly".
In my head I can't help but think "he ate nothing but meat/ she drank a bottle of wine a night/ they haven't broken a sweat in years".