Hello and Goodbye

I was 13 years old when I first heard Sergio Mendes & Brazil '66.
This song came to mind...

We wandered through the summertime

And drifted into fall;

We never thought of winter at all.

How foolishly we tossed away

The buttercups, the time 

Who'd have thought

We'd have no more songs to sing,

Hills to climb?

We summered in each other's arms

And slumbered in the glow;

We never heard the whisper of snow.

But summer's not forevermore,

No matter how we try

The trouble with hello is… goodbye