Epiphyseal plate closing normally occurs between the age of 4 and 24 months, and varies depending on location within the limb and breed. Obviously, shoeing for this type of correction must begin at a very early age (as young as new born foal can benefit from this) to be the most effective on your horse. Generally most horses need to be started on corrections by 12 months of age. Once the epiphyseal plates have closed, corrective trimming and shoeing can still be done, however, the degree of correction is much more limited.
Safire Farrier Service will take great care to make corrections gradually in order to minimize the stress on the horses joints, tendons and ligaments.