Answer:
What measures out time. Until in time all is smashed to it?
When young, I am sweet in the sun. When middle-aged, I make you gay. When old, I am valued more than ever.
I have legs but never walk, I may have flowers but no soil, I hold food but never eat.
Half-way up the hill, I see you at last, lying beneath me with your sounds and sights. A city in the twilight, dim and vast, with smoking roofs, soft bells, and gleaming lights.
I work when I play and play when I work.
As round as an apple. As deep as a cup. All the king's horses can't pull it up.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?