Justin recites some lines from the play Our Town to Via. (p.194) What one word sums up the theme in these lines?

Can you quote the words that he recites? Thanks!

I'm reciting: yes, the sun's come up over a thousand times. summers and winters have cracked the mountains a little bit more and the rains have brought down some of the dirt. 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...