Urgent on the scale of decades
There are some things you really want to do. Yet, you never feel a real urgency to do them so you don't get around to it.
But then time passes and one day you wake up only to notice that while you could still do the thing, you don't want to do it anymore.
This doesn't mean the thing wasn't worthwhile doing in the past or has some inherent virtue to it. Instead, you're simply not the person anymore who wanted to do the thing.
On the one hand, you're freed by the desire of longing for the thing, yet in a way you've shortchanged yourself and cheated yourself out of the experience.
You missed this window of opportunity to eagerly do something. And while you still very much could do the thing, you simply don't want to anymore and almost can't imagine why you wanted to do it in the first place.
You're not less happy for it (since right now you don't care anymore), but instead you've cheated yourself out of the memory that was to be had.
In Michael Ende's Neverending Story (the book not the movie), Bastian the main character is granted magical powers that border on omnipotence in the second half of the book. However, each time he makes a wish – being strong and athletic instead of short and chubby, or clever and handsome instead of being dull and plain – he loses the memory of ever being short and chubby, and being dull and plain. The more he's freed from his desires and longing for something, he's also robbed of his memory and slowly loses sense of his own identity.
Some of our longing and wishes are fickle in a way, and if we're not careful they disappear and we can't even remember anymore what it felt like to long for that thing. Unless we turn our wishes and desires into experiences and memories, we will forever lose that part of ourselves.
Traveling the world on a budget, staying in hostel, crashing on friends couches while all so appealing in your twenties becomes something you simply don't want to do anymore in your 30ies. And if you didn't do it, it becomes a lost memory.
Casually dating with an unburdened and lighthearted, genuinely meant enthusiasm is one of the big joys when you're 23. Relishing each little conquest and exciting encounter. But the same experience, albeit it remains a story you'll happily retell for decades, you will experience as empty if you had it at 32. You will never really get a chance to feel that again (nor would you want to), if you didn't do it then.
Living with roommates. Great in your twenties. You still could technically do it in your thirties, but you most likely don't want to.
There are some things, that don't feel urgent since they seem like something you could still do tomorrow. Until you wake up and you don't want to anymore. I start to remind myself of this on a regular basis: what are the things I need to do now before the desire for it expires?