Answer:
The higher I climb, the hotter I engage. I cannot escape my crystal cage. What am I?
My days are numbered. What am I?
I have a lot to say but can't be heard because I can't speak one single word. What am I?
What can be cracked before it's used?
I start new then become old. Start clean but be one dirty. I usually start big then become little.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.