Yes, I play Minecraft on my Windows 8.
Any age can play Minecraft. However, the most common age range tends to be between 8-14.
1-8
8 wooden planks and 1 diamond makes a jukebox on Minecraft. You can play music discs that you find using this.
Minecraft does not need to update for it to be compatible with Windows 8
No as they are 2 different systems you would need Minecraft Pocket Edition for the windows phone. There has also been no plans to do a cross-play due to the impracticalities of going from a console to a phone.
anyone can play guitar.
yes
Minecraft is suitable for all ages but most users are probably between 10-20
I would not recommend it but you may see that many 8 year olds play halo...sadly...
the harmonica
There can be up to 8 players at once in a lobby.