I have a lot of 16 year old sawtooths that produce a ton of acorns very early in the fall. The first acorns came at age 9. At 10 the trees really produced a lot of acorns. The drought hit them last year and they dropped the acorns before maturing. I would leave them alone unless you need the space. You already have several years committed to their growth.
Granted the sawtooth acorn drop is too early for hunting, but it brings a lot of deer on to our farm as archery season opens. This is part of our strategy to have food sources available all the way through January.