Step 1 :The problem is asking for the probability of a specific event happening. In this case, the event is selecting the 4 oldest people from a group of 9.
Step 2 :The total number of ways to select 4 people from a group of 9 is given by the combination formula \(C(n, k) = \frac{n!}{k!(n-k)!}\), where n is the total number of items, k is the number of items to choose, and ! denotes factorial.
Step 3 :The event we are interested in (selecting the 4 oldest people) can happen in only one way.
Step 4 :So, the probability of this event is the number of ways the event can happen divided by the total number of possible events.
Step 5 :Total number of ways to select 4 people from a group of 9 is 126.
Step 6 :Number of ways the event can happen is 1.
Step 7 :Probability = \(\frac{1}{126}\)
Step 8 :Final Answer: The probability that the 4 oldest people are selected from the group is \(\boxed{\frac{1}{126}}\).