A nice visual version of this memento mori is Tim Urban's "Your Life in Weeks":
https://waitbutwhy.com/2014/05/life-weeks.html
After reading this, I used this nice online PDF generator to print out my personalized life calendar, and kept it in my home office with a pen nearby, checking off the passing weeks occasionally (every month or so).
Spending some time to check off the first ~2k weeks -- checking a little box for each week of my life thus far -- was quite an emotional thing, actually.