When it comes to retirement planning, does age matter? Or should clients at each age be focusing on the same things?

What are some actions or behaviors that clients in their $20$s can do to establish a strong financial future?

By the age of $30,$ clients should have how much of their starting salary saved for retirement?

For clients in their $60$s$,$ what are some things they can do to ease longevity concerns?

Do you agree with the author$$s assessment for actions and behaviors that are important for your life stage? Is there anything else you would add?