"Any one over 40 will remember this" is a common phrase used to refer to a nostalgic memory or experience that was popular or relevant during the 1980s or earlier.
This is because memories are often associated with strong emotions and experiences. As we age, we tend to accumulate more memories and experiences, making it easier for us to remember things from our past.
People over 40 may remember things like popular music, fashion trends, TV shows, and technology from their childhood and teenage years. They may also remember historical events and cultural phenomena that were significant during their youth.
It is not necessarily that memories are more vivid, but rather that they are more prevalent. As we age, we tend to forget smaller details, but we have a tendency to remember significant events and experiences from our past.
While there is not a definitive answer, research suggests that nostalgia and the act of reminiscing can have positive effects on our mental health. This may explain why older individuals tend to remember things from their past more often, as it brings them joy and comfort.