Will Ears Grow in Size After Otoplasty?

Otoplasty is performed to change the shape and appearance of the ears.  Otoplasty is a permanent procedure. The underlying cartilage of the ear is what gives the ear its shape and appearance. In an otoplasty surgery, the cartilage is sculpted to change the shape of the ear.  Occasionally, skin and cartilage are removed as well.  This will depend upon the shape of your ear and the necessary correction.  I always aim to achieve a natural look and modify a procedure based on this.  You should seek a surgeon that you feel comfortable with for the procedure prior to proceeding.

It’s important to understand that
ears change throughout a patient’s lifetime.  It’s also important to realize that changes associated with
setback otoplasty are designed to last an entire lifetime.  Although minor ear changes occur with
aging, these changes would have no impact on the results of your otoplasty.

It’s unfortunate that you’ve had a
bad experience with your plastic surgeon. 
Under these circumstances, it might be appropriate to seek a second
opinion from a plastic surgeon with better communication skills.

It sounds like you didn't get good advice at your consultation.  I would suggest that you go onto the American Board of Plastic Surgery website and find an experienced surgeon who performs lots of otoplasty surgery and go see that surgeon.  I perform otoplasty on young children (as young as 6 years old) to adults with lasting results.  I have never heard of a surgeon telling a patient that the otoplasty results will only last 6 months.  Do some more research!