Wow thanks for the pics
On an image of Buddha as an old man, its a shame there arent any statues of him at old age. For me it would make it more life like
Why don't you make one? Or ask some sculptor to make one? People seem to have felt free to make Buddha images in a large variety of shapes already, so the Buddha as an old man should be perfectly acceptable. None of the images are real portraits, anyway. They are just visual expressions of a concept.
This saying from the Mahaparinibbanasutta might serve as a starting point for conceiving the image:
"Now I am frail, Ananda, old, aged, far gone in years. This is my eightieth year, and my life is spent. Even as an old cart, Ananda, is held together with much difficulty, so the body of the Tathagata is kept going only with supports."