Even the Christmas cards we used to get from Britain we so beautiful. Unfortunately, because memories die when people do, if we don't record what people tell us it is history that is lost for ever. Everyone forgets things as time goes by and we all remember things in different ways. Some people's memories are better than others and for reasons we don't really understand, many people actually remember their early years more as they get older. This is helpful when we want to tape-record peoples memories.
All memories are a mixture of facts and opinions, and both are important.
The way in which people make sense of their lives is valuable historical evidence in itself. Few of us are good at remembering dates, and we tend to telescope two similar events into a single memory.