Is it possible to start out at, let’s say, 20 years and be sharp as a knife. Never forgetting things, never dropping things, always have an answer ready and can do multiple things at once. And then around 30 you suddenly drop stuff you have in your hands, you forget if you locked the door, your contactlenses have gone missing from the storagecontainer, people need to stop talking while you drive?
If it happened suddenly this is not normal and you should see a doctor
If it’s happened gradually it might be the result of more stress, less sleep, etc, but you still might want to consider talknig to someone. Conditions like thyroid issues can cause a global reduction in function like that and it can be insidious.