In midlife, people can become so overwhelmed with multiple demands on their time that they can't get started on anything, much less those tasks that they need to get through somehow. You've got to get stuff done at work, pick up your kids, finish cleaning out your closets, maybe head to the gym, and get dinner on the table.
I have my own theory about why some people retire happily and others get depressed or ill upon retirement, about why some people drive fast and like rollercoaster rides and horror movies, and others-- like me-- absolutely refuse to see anything violent and frightening and have always avoided scary rides in amusement parks.
When it comes to worrying, my mother was an Olympian, and she tried her best to train me to win a gold medal, too. I came close, but in my mother's eyes, I never worried enough. I've logged many sleepless nights perseverating about making the right choices, saying the wrong things, whether I would meet deadlines, having a car accident, and being a good-enough mom.
Scientific research about whether you should include a pet in your online dating profile pic is, not surprisingly, rather flimsy. According to some studies, a dog in your profile photograph is guaranteed to get the replies rolling on... and then, according to other studies, a dog can actually reduce your chances of finding a date.