A more thorough explanation:

Definition: An unrealistic belief that any person, regardless of age, infirmity, or physical deficiency, is capable of having a child. This notion can cause legal issues, such as property title disputes, if someone is waiting for a potential sibling to be born before inheriting property.

Example 1: A 90-year-old woman believes she can still have a child and refuses to update her will to include her grandchildren as beneficiaries. This causes a legal battle between her children and grandchildren after her death.

Example 2: A man with a severe genetic disorder believes he can father a child despite medical professionals advising against it. He spends thousands of dollars on fertility treatments, but ultimately is unable to conceive.

These examples illustrate how the belief in a fertile octogenarian can lead to unrealistic expectations and legal issues. It is important to understand the limitations of the human body and seek professional advice before making important decisions.