I would expect a proper diet to facilitate youthful, supple skin, on in to old age. The way we can see that this is not unreasonable is to look at older members of the animal kingdom (not that we are apart from it, but nonhumans in anycase), if they make it to such an age, the wear is generally cosmetic/mechanical (due to physical lifestyle ie hunting prey, evading predators, territoriality), but they are in otherwise good condition.
Aajonus is not a good example of that even though he probably does eat immaculately (with the exception of dairy, he is pretty hard headed about dairy and might not recognize it as harmful to himself even if there were signs). The core reasons he's not a good example are that he's had terrible surgery and pharmaceutical poisons if his claims are true. The body is a wonderfully resilient structure, but things like chemo, radiation and surgery can damage it beyond it's restorative ability.
If you don't have nice supple skin at least in to your 40's and 50's then it's time to tweak your diet. I've been thinking about this a ton lately as I pay extra close attention to folks when I'm at the co-ops. I see the vegans and vegetarians with sallow skin and rotting teeth, stringy hair and looking pale and sickly. I see people with tons of acne loaded down with sugars, carbs and processed foods. I see balding fellas with lots of grain in their baskets. I just want to shake these people and say "how long will you continue down this road when the proof is staring back at you ever time you look into the mirror that your way of life isn't working?"
Or a lady who bought 5 lbs of morels from me today. She's a green witch, master gardener, herbalist, makes tinctures, lots of lacto fermented foods and is in to pastured meats. In spite of that her hair is stringy, skin splotchy, some rotted teeth .....and she's unsure about raw meat?
I like to model on success. When I want to do something right, I look for someone who's got results AND what they're saying makes sense. I myself have thought that Aajonus didn't look very good on most occasions, but due to mainstream medicine's interference I had to overlook that because the raw way of eating just makes too much sense to be ignored. Now that I've experienced it, I can look in the mirror and see the proof for myself. I can also make myself look gaunt and sickly by switching to crappy food and/or overloading my system with too much ganja, or otherwise stressing or tox-ing it out.
But as long as I'm getting my raw organs and a few greens here and there as well as some sun, I 'look' healthy AND I've got loads of energy and a good disposition.
I'm excited to see the first generations of children growing up mostly raw, will be neat to see how they differ developmentally, physically and emotionally as they age!
Genes of course are a factor, but more in that if you're eating shitty food you can still look young for a while if you've got the right genes. But if you're eating properly from birth, you genes should be almost irrelevant until you get in to the upper reaches of old age.