This may sound ridiculous but...?

When you are 30 and 40, you will most likely have a family and a job. So dressing up like a 15 year old is not really a good idea. Skinny jeans do not look good on older women. But you do not have to lose the indie/boho feel in your wardrobe at all. Bright scarves and sashes look great and are catching on. Long skirts are also in, as well as leather boots. The website in the sources is absolutely amazing.