To retain information in your memory, processes involved are- attention, storing in your memory centre & ability to recall it back when required. If there is any problem in the above process, then you may have memory disturbances. Causes for the same can be multiple - inattention, brain disease, vitamin deficiencies, medical causes,hormonal disturbances, depression, anxiety. At the age of 39 yrs, serious brain disease is unlikely unless there is high bp, diabetes, lipid problem or family history. Please visit a doctor who can conduct memory tests, investigations & accordingly treat it.