This statement is true. According to an article from Australian Eggs, "Vulnerable people or those with compromised immune systems- including children, pregnant women, and elderly people- should not eat foods that contain raw eggs." The article emphasizes the fact that elderly people are more at risk when they contract food poisoning, as their bodies are not strong enough to fight off aggressive illnesses. For this reason, elderly people should ensure that their eggs are fully cooked to avoid the dangers that can arise from consuming raw eggs.
Source: australianeggs.org/au/facts-and-tips-/eating-raw-eggs