I've used a hyaluronic acid cream along with a Vitamin C serum, twice daily, for almost five years now, along with nightly use of a Clarisonic brush. At 65, I have minimal wrinkling and my skin looks polished enough for me to forgo daily use of foundations and concealers. Yes, I do have lines that run from my nose to my mouth, a couple of vertical lines between my eyes on my forehead, and a few crinkles near the edges of my eyes and the corners of my mouth. A bit of illuminating cream for special occasions seems to "airbrush" those depressions so I don't get too bothered by them. The results of topical application of hyaluronic acid and Vit C are backed by some reputable studies so I'm comfortable using them. They aren't miracle workers, though, so if you are looking for a dramatic change you'd be disappointed.
Each to her own, but I'm with Angie that good skin care, a bit of makeup, and joining the Team Embrace the Jowls and Laugh Lines seems to be enough for now. My BFF, who is four years younger, has spent serious money (20 + grand) on fillers, BoTox injections, and laser treatments in the past three years. To my eye, some treatments have been moderately successful, while others either didn't last, or, even worse, ended up looking slightly odd. I think the skill of the practitioner really makes a difference and I'd be leery of making a choice based on price alone. To me, the difference between not enough, good, and too much is pretty narrow, but can make for some widely varying results.
My friend can afford to be picky about who she uses and can afford her treatments, so she absolutely has the right to do what she wants, but I think it is getting harder and harder for her to stop searching for the next product or treatment that will hold the signs of aging away. She is currently looking into treatments for her neck and hands. It's interesting that she doesn't think of these "treatments" as being in the same category as plastic surgery.