Poor memory! but it may just normal? Everyone will encounter such condition. Not only to the brain, but also pay attention to the body exercise.I agree, but what is normal. We are used to the stereotype of the absent minded professor who's mind is so full that she forgets to eat, wash, sleep... But a change from what is normal for us might indicate, say, small vessel disease. Yes, exercise, keeping weight down, avoiding diabetes can help ward off vascular dementia, but it's worth getting checked out.
Some people may have had problems since birth eg ADD where they can be very intelligent as measured by verbal reasoning tests, but are handicapped by poor working memory. Again, worth getting assessed.
One thing is certain, whatever is normal now won't get better in the future. Hang on to what you've got.