I recently had a facial. I am 47 with combination skin. I was told that I should not be using any creams for my age and combo skin. She said I should use oil-free and only a hydrating serum. Creams just sit on the surface and never get absorbed. So, I did switch to an oil-free serum and it works great. It really does absorb wonderfully, and my skin feels great. However, I cannot find an oil-free serum that has SPF in it and now I'm not getting any SPF. If I buy a separate one, they are in cream form and always oily. Can I get some recommendations?