Generally happens when you start having kids. Somewhere, around the age of 8, they'll start asking you about dinosaurs and how you lived then.
Just play along, tell of the hardships of life then, including the fact when things got really bad, people sometimes ate their young. If they don't believe you, just tell them to ask their brother, Billy. When they day they don't have a brother named Billy, reply, "No, not anymore. (Burp) but he was a fine broth of a lad. Just needed some seasoning, but an onion, acclove of garlic, and a little salt took care of that."