I've recently turned 39 and have taken the plunge and got Profhilo. It is an injectable hyaluronic acid that isn't quite a filler but remodels the skin, boosts moisture and helps with loss of volume. My skin is quite good anyway but this has given it a real boost and it has a sheen to it that it didn't before. I would recommend it. I haven't had Botox or fillers. I paid £600 for two sessions. It lasts for 6 months or so but you only need the one dose to top it up then.
If anyone who wants to try it has any questions, let me know.