The difference between an aging brain and dementia

Forgetting small things such as dates, and events and difficulty in recalling old information can be a normal part of aging. But at what point does it go too far? Do you have to worry every time your memory seems to fail you?
Forgetting small things such as dates, and events and difficulty in recalling old information can be a normal part of aging. But at what point does it go too far? Do you have to worry every time your memory seems to fail you?