Didn't see anyone suggest it, but I can't recommend it enough, spend time with your parents, and, if they're still alive, your grandparents!

This really put it into perspective for me.

If you were a late baby like me, your parents are likely getting into their 70s now. You may have 20 years with them. You may have 5. I'm lucky if get to see mine once a month because of work. That's around 60-240 times left to see them. If I spend an hour with them each time(which is a stretch), that's 10 days tops. Enjoy the time you have with them and pray you're lucky.

Also, if you have any loved ones, tell them you love them every chance you get. My wife and I have traded "I love you"s nearly every day for the past 23 years. You never know when it'll be the last time, so say it as much as you can to anyone you care about! It doesn't cost anything, and tell me it's not great to hear when someone says it to you. Spread that shit around!

Lastly, if you can afford it, travel. You don't have to travel the whole world, and it doesn't have to cost a fortune. I know people hate on them, but my wife and I book at least 1 AirBnB a year. We find a cheap place that's only a day's drive away and book it for a week. Just get outside of the safety net that is the streets and places you know.

For that matter, take any opportunity you can to make new memories. We are creatures of habit, and our brains don't like to waste. It's believed that one of the reasons our days feel like they fly by is because we're following a routine that our brain meshes with the memory of similar experiences and routines to save energy. Being in new places, experiencing new things, and making new memories may help with breaking up those moments where the day, week, month, or year are gone in a flash.