I am in esthetician school and there we were taught that toning is not an essential part of aging prevention. Toner is actually used to give a fresh, nice feeling on your face. Toner can also be used after washing your face with a cleansing oil. It helps remove all leftover oil that you didn't completly wash off. But don't worry, if you enjoy the feeling of toner, it doesn't harm your skin in any way. So you can continue as is.