Everyone is different. I see people riding in shorts when it's 48 degrees .
That said, there's a big difference to me between 45 degrees and 35. I have 3 kinds of base layers (sleeveless, short sleeved, long sleeved) that are not wool. The long sleeved ones keep me very warm. I also have some smart wool very thin base layers. At anything below 50, I have tights on over my shorts. I have Sugoi mid zeros and sub zeros. The sub zeros go on in the 30s. Varying levels of wool socks. Many, many head covers, fleece and wool, or buffs. I have 3 different thicknesses of full fingered gloves, too. I find the combination of jerseys and base layers the most difficult to get. I have heavy thermal ones, light weight thermal ones, and a couple of regular long sleeved jerseys. I have a regular light wind jacket and a bullet proof Assos winter jacket that I could wear in the tundra. I bought it for less than 50% of the regular price. Toe covers (2), 2 types of booties, but in the last 2 years, I have bought winter cycling shoes for both my road and Frog pedals. It makes it a lot easier.
I find it hard to dress for temperatures between 48 and 65, but I prefer layers, as in leg or knee warmers, base layers, arm warmers and a vest or light jacket.