In my experience, the best mature skin that I see belongs to women that have been using natural products for an extended amount of time. Their wrinkles are minimal and skin is taut and firm thanks to all the topical nutrients they've been getting. The second best skin surprisingly belongs to people that claim to use nothing at all. They say things like "I just splash water on my face" or "I just use soap". This is leading me to believe that conventional, petrochemical products are aging people's skin prematurely. It makes sense since many of these chemicals are harsh and inflammatory and can stress the skin.
You may wonder why some celebrities have beautiful skin when they are clearly purchasing luxury lines that don't make any 'natural' claims. This is because most of those high priced lines use a lot of botanicals in their formulas. Take for instance the very popular and expensive Crème de la Mer. It contains seaweed extract, lime, eucalyptus, lanolin, sesame, alfalfa, sunflower, and almond. Natural ingredients take up a good portion of this formula so it would be similar to a natural line in performance. When you look at a low priced (under $10) cream that you would buy at a drug store, it will be 100% petroleum and palm-based synthetics, which is how those massive companies are able to price it so low. This is where the bad performance comes in.
Natural is the way to go and the best thing about the green beauty industry is that you get the best bang for your buck because you get luxury ingredients that aren't priced that way.