Read the excerpt below and answer the question.
Three years have gone by. Yes, the sun's come up over a thousand times. Some babies that weren't even born before have begun talking regular sentences already; and a number of people who thought they were right young and spry have noticed that they can't bound up a flight of stairs like they used to, without their heart fluttering a little. All that can happen in a thousand days.
This excerpt from Our Town conveys _____. Select all that apply.
universality
individuality
the passage of time
the fleetingness of youth