Ronan Horn Progression

For my character, Ronan.

His horns will continue to arch over his back well into his late prime, much in the manner of an ibex, in addition to the three-four spikes that grow from the underside: Example (minus the spikes)

Naturally, Ronan must take the greatest care when arching his head back to look upwards, or turning it left and right at such an angle, but most of the time the horns will hang wider than the width of his shoulders, and so he will not have to worry about the growing too big. Unfortunately, they will be incredibly heavy in his elder years, and so deformations may occur (in the horns, his back and his legs). His neck will grow to be particularly thick, but a bit disproportionate to the rest of him.