Dead to the moment
Here is the thing: I don't have 30 years left. I might have them on paper (again, knock on wood), but in reality, this number is much, much smaller.
Because during these 30 years, for the majority of the time, I won't be truly present. I won't live in the moment, but instead either regret the past or worry about the future. And worse, I'll be wasting my time with trivial things that don't bring me any closer to... well, anything.
Being present takes work. You need to remind yourself not to be dead to the moment. But the more you do this, the more effortless it becomes.