Yes bed wetting in a 10 year old boy is very normal and usually nothing to worry about.
Some kids stop wetting the bed at age 5 or 6 whiles some continue to wet the bed at 10 years old and even 15 to 18 years old.
The cause of bed wetting in children including 10 year olds is usually due to a small bladder that eventually grows to proper size as the child ages.
Sometimes bed wetting can be caused by stress or even a cold room and sometimes rarely a bladder problem such as a bladder infection or weak bladder muscles could cause the 10 year old or child to wet the bed at night.
I would recommend having your 10 year old wear some diapers or absorbent disposable pull ups that you can purchase for 10 year olds and above.
And use a mattress protector that you can wash easily.