Radium wrote:

I am aware the average age at which long-term retention of memories is
3. What the earliest age known at which a person has had long-term
memories that were retained in adulthood [i.e. something similar to the
Guiness Book of Records for earliest memory]?

Studies show that people actually start to keep
long-term memories at around age 2. That is
based on studies using babies at different ages
and checking if they recall objects or rooms
after two weeks.

There is also a theory that long-term memories
occur only with speech/language development.
So, it is entirely probable that one would
remember events shortly after one started to
speak.

-- Anita --