Is it ok to write a short novel for older children if i want?

Question:

Is it ok to write a short novel for older children if i want?

if its for like fifth grade does it have to be long (as in 200-300 hunred pages) or can it be short (like about 100)? like is there a minimum it has to be?

Additional Details

6 days ago
i meant 2 or 3 hundred not 200-300 hundred

6 days ago
someone told me it should be long, so i was only wondering

Best Answer - Chosen by Asker: 6 days ago
i meant 2 or 3 hundred not 200-300 hundred