The document discusses how the concept of retirement age and what defines "old" have changed over time as lifespans have increased. It notes that the traditional retirement age of 65 was set over 100 years ago when average lifespans were much shorter, but people now often live 20-30 years past retirement age. As a result, many view the marker of being considered "old" as being between 75-80 years old rather than 65. The active lifestyles of celebrities in their 60s and 70s in Paris are presented as examples of how seniors may live in the future.