Just Simple-Convoluted, Rational-Nonsense

Black of night
Light of day
I used to go
But now I stay

Summer heat
Winter cold
I once was young
But now am old.

Desert dry
Ocean wet
I used to freeze
But now I sweat.

Full glass
Empty cup
I once was down
But now am up.

Vinegar sour
Honey sweet
I once was strong
But now am weak.

fancy hat
Ball cap
I once was lean
But now am fat.

Cool blue
Hot pink
I used to leap
But now I think.

String bikini
Formal gown
I used to smile
But now I frown.

In time
Out late
Time now to end
This foolish prate.