I have a feeling we'll both be worm food by 80 or 90. The difference being my ilk had a better appreciation for time, while yours thought they'd live forever.
Contrary to the person you're responding to, I think it does make a large impact on the day to day. It's going to drive very different philosophies of life. One obvious embodiment of this would be on fertility. One who ignores, let alone denies, their own mortality is going to, on average, a different perspective on fertility than somebody who accepts their own imminent mortality. And these sort of things can often sort of snowball into impacting many other issues in life, in very significant ways.
Day to day, not at all. Just more generally. How many times have we heard 'I wish I'd visited my X more before they died.' Timelines and sense of mortality force you to think about such things.
It's definitely not about taking solace in winning some inane argument. I won't be celebrating my death, nor yours, as some kind of win.
You think the problem of aging cannot be resolved?
Aging has long been characterized. We understand in which ways degradation happens, and no new ways have been found for several decades. There aren't that many; They can be tackled, one by one.
We have an assortment of tools today that weren't available a mere 20 years ago, and it is our moral imperative to do this research.
There's more people suffering from aging and the conditions it does cause than any other health issue. All of us will eventually degrade, suffer and perish if nothing is done about it.
Improving the quality of life of our aging population by supplementing the shortcomings of metabolism (and thus un-doing aging) is the target.
Because if better appreciation just means you're on the right side of an argument that very rarely comes up, then your life quality is the same.