There's definitely more to be said, but there is a part of our FAQ which has some answers which address similar questions to these:

• What's the oldest recorded part of history that is so old that we literally can't obtain any information on anything older (ie. then up to religious interpretation) by /u/tweedy_impertinence
• I recently read a quote saying people die twice. The first when they physically die and the second when the last person that knows their name dies. So who's the oldest person we know the name of? by /u/kookingpot
• Oldest person we know to have existed? by /u/Tiako