It's what is important, but not the only thing that matters.
Why do people want to have a home if only now matters ? They are young, they don't need to have a place that is theirs. Why do they buy a fridge for that home ? They just have to buy what they eat when they want to eat it. Why do they own an oven, a microwave ? They can buy their meal already cooked.
Why do they search for a job ? Right now they have enough to live through the day...
You wouldn't be seated in front of a computer, writing here, if you really lived through the concept that only here and now matters, because you wouldn't have a computer, nor a place to seat. So, unless you're at a library or any place where you can borrow a computer, a place with a so lax security that it let you goes on an adult/porn games forum, that only here and now matters is nothing but an illusion you put in front of your own eyes.
Such peoples exist, but even them think, to some extend, about tomorrow and the next week. Even real nomads think about the future. Prepping the place they'll stay so they'll not get wet if it rain. Deciding to move to the South when winter is approaching, then back to the North when it's summer that approach.
They live for now, but know that tomorrow is as important. Not being obsessed by the future doesn't mean that they totally discard it.
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. And like it's an average, not only between men and women, but also between healthily and none healthily, and like it also take count of accidental death, in most of the world nowadays one can easily expect to live up to 80 years and more, at least if he take care of himself.