Forgetting things is normal - if you were 20, you would just say it was because you: were hungover, studying too hard, stressed in your new job, doe-eyed and in love with the new person in your life, etc, etc... Because you are 'of a certain age' you have: dementia/Alzheimer's, suffering from the menopause, 'losing it', or any of a number of other stereotypical 'reasons' for forgetting something. As I said, forgetting is normal.
What is not normal is forgetting what you use the teapot for, putting the dishes in the airing cupboard, being unable to name familiar household items, seeing small animals or children that other people tell you are not there, hearing music/voices that no one else can hear or being unable to draw a clock face and place all the numbers in the right parts of the clock.
There are a number of tests on-line which should reassure you or inform you that further investigations might be warranted.
Sometimes it's just the hard-drive that is so over-full it's difficult to process everything that needs to be done/thought about!
PS - I'm a nurse, btw, hence how I have a little insight into memory/cognitive-related conditions.