Today is the least busy you'll ever be.
Think about that for a second.
Houses and puppies and kids and cars are coming. They're all going to need the best hours and years of your life and on top of that, work isn't about to slow down. So before that sneaks up on you, step outside barefoot and smell the midsummer night's breeze. Before you're truly too busy, realize that this is the freest you'll be for the rest of your life.
So do you really have time to complain about how little sleep you got? How little time you have for the gym? Or how you're "an old soul" and would rather sit on the couch than meet an old friend for a drink? Right now, you are blessed and you are free. Go out and see them. Next year, you may not have the luxury of time.
So c'mon, what's that thing that you're too busy for? Right now is the least busy you will ever be.