I like the skirt on you. In full disclosure, I own one very similar to it, so I may be biased! I do agree that there is something about the proportions of the outfit with it that is a tiny bit off (though I think only those of us who have had our eyes opened to proportion and such would ever think that--and then only after we'd been asked to study it). I've tried pairing mine with a couple of sweaters that are just slightly looser/boxier than the one you show here, and I think that may be a slightly more pleasing look to my eye, though I do need to take some photos of me to study!
Does the skirt have a fitted waist that hits at your natural waistline? If so, it may be that you could do a nicely fluid blouse or thin, nicely draping sweater tucked in, perhaps with a lovely belt. My own skirt is a tad too large at the waist for me to do this, though I wish I could! Time for me to visit the tailor, I think!
I've attached the skirt I have below in finds because I think the shape of outfit shown on the model could be quite attractive on the right figure and could also work well with a shapely cardigan on top.
As for the skirt shape itself and your age, I think it's fine. I'm probably a similar age, and I am quite comfortable with it with tights and boots, but I would not wear it bare-legged as shown below.