Memento mori is just the ultimate reduction of the sentiment.

The whole stoic philosophy behind it is interesting. It's not just that you will die no matter how long you can put it off for. Once you are gone all that's left of you will be memories and descendants.

Even if you are remembered for a long time, like for example someone as famous as Marcus Aurelius, those memories aren't you they're just a reduction. You're gone forever.

You could extend that to consider the self you were 10 years ago. That you is also gone forever.

All in all it can be a freeing thing to contemplate. All you have is the right now so enjoy it or at the very least bare it.