As an adult, I do grown-up things like go to work daily, keep up with current events, drink wine with friends, keep up with my family, worry about my credit rating and 401K. All sorts of normal, responsible, adult things.
I also have a gerbil. In fact, this is the sixth gerbil I’ve had in my adult life. I’ve also had four hamsters, three mice, fostered a rat for about two weeks, and provided a place to sleep for a wild mouse one night (it was VERY cold outside).
In short, I like rodents. I care for them, give them a large home, toys, good food, and medicine when they need it. I have them long enough to get attached, and then they die.