Final answer:
The information about Marques' high school graduation party was stored in his long-term memory, specifically in the form of episodic memory, which allows for detailed recall of personal events.
Step-by-step explanation:
When 80-year-old Marques is asked about his life and is able to vividly recall his high school graduation party that occurred 60 years ago, the information was stored in his long-term memory just before it was recalled. This type of memory allows individuals to store information for extended periods of time, ranging from a few days to decades. In Marques' case, he likely accessed what is known as episodic memory, which refers to the ability to recall personal experiences and specific events that occurred at a particular time and place in the past. Some individuals, like Marques, are able to remember these events in great detail due to the encoding and consolidation processes that took place when the memory was originally formed, thereby making it easier to retrieve later on. However, it's important to note that human memory can be prone to inaccuracies, and the way we remember events can be influenced by various factors including subsequent experiences, societal input, and the passage of time.