A family photograph can show you doing something you do not remember. A friend can repeat words that sound like yours but awaken no scene. Whole years may survive as a few rooms and faces. If you cannot enter a period from within, in what sense is it still your past?
The easy answer is that it happened to the same body. Yet personal pastness is more than location. Memory allows an earlier event to join present judgment—to become something we recognize, interpret, and sometimes revise. Without that access, a period belongs to us asymmetrically: its effects can remain while the first-person route back has closed.
That closure does not automatically cancel responsibility. A remark can injure someone who remembers it even when you do not. Lack of memory may matter greatly to how an event is explained, especially when illness or unusual conditions are involved, but it does not make the event disappear. The world can keep what the mind loses.
Other people, records, objects, and habits may preserve fragments for us. Their testimony deserves attention, but it does not give the most confident narrator ownership of our whole story. Evidence can be weighed. Interpretations can be challenged. Admitting a gap is not the same as handing one's identity to whoever claims to fill it.
Forgetting is not only failure. If every ordinary sensation and mistake remained equally available, the present might never clear enough to receive anything new. Most experience must retreat from the foreground. It can continue as a skill, an expectation, a bodily response, or the trust built by care we can no longer itemize.
A continuous life does not require a complete archive. It requires honesty about the archive's limits and willingness to take up what can still be confirmed. Forgotten time may be ours through consequence, relationship, and formed capacity even when it is no longer ours as recollection. The gaps remain gaps; continuity consists partly in refusing to use them as exits.