I have a young rooster about 9 months old.
He only has 2 young pullets to "engage in activity"

I also have 2 hens that are 4 years old.
One of the older hens is a bit ornery.
I put her with a young rooster before, & she beat him up.
He was never able to mate with her so I removed her.
QUESTIONS
~ Would it be OK to give him the 2 older hens?
~ Could the roo be in danger of catching something because the hens are much older?
~ Would it be better to buy him a few pullets instead?
THANX for any input!