A Riddle, A Riddle!

"A Riddle! A Riddle!" Cried the children that night!
"A Riddle! A Riddle! But one with no fright!"

Who can make sound, but never speaks?
Is never late, and never early?
Who is old, but sometimes new,
and prefers gold instead of sterling?
Who is straight and tall, but has many curves?
Who never gives up,
Who always keeps on going?