I can't provide specific advice that would be "absolutely useless" in 2023, as I don't have access to real-time information beyond that date. However, I can speculate on some advice that might become less relevant or outdated due to changes in technology, societal norms, or other advancements. Keep in mind that this is purely speculative and not a reflection of actual advice given by older people in 2023:
"Always carry a map or ask for directions when traveling."
With the prevalence of smartphones, GPS navigation, and digital maps in 2023, the need to carry physical maps or ask strangers for directions may have diminished significantly. Many people now rely on navigation apps or voice-activated assistants to guide them during travel, making this piece of advice less relevant in the modern era.