It's mental, don't just dismiss the problem and accept it as normal ...
Honestly guys, don't dismiss "losing things" as a "normal" and accept it that way.
It's very, very, very important you take proper tracking of your daily activities very seriously as you get older.
It keeps the mind sharp to train it "to care" about such small details.
If you just ignore such you will quickly program your mind not to care and you will only get worse.
It starts when you're a kid and you forget your jacket.
It goes beyond simple mindedness, it goes to how you address many things in your life.
Make a concerted effort to track what you do, where you put things, etc...
If anything, pick a few "safe spots" around your house, or in any location you frequent, and force yourself to use them.
Sooner than later you'll start noticing what you do and where things go.
Trust me, I had to fight this and I realized in my mid-20s that I really need to change direction.
I'm very glad I did.