My mom came of age in the 1960s and had a natural, flower child kind of look. She still rarely wears makeup, doesn't dye her hair (she's gone gray and beyond, to a soft, platinum-y white) and is anti-cosmetic surgery. Her beauty routine consists of a daily walk, regular yoga, cross-country skiing, rinsing her face in the morning, washing her hair once a week and heavy SPF for any outdoor activity. And, at 64, she looks great.
The advice she gave me was simply to stay away from chemicals as much as possible. Dyes, fragrances and harsh soaps are bad for you, has always been her stance -- turns out she was ahead of the curve on that.
I've definitely experimented with makeup and products more than my mother but I do remain true to her general philosophy, going with organic products, minimal makeup and a simple routine. And I hope that in 27 years I look as naturally beautiful as she does today.