I was just wondering what people would class as a "good average" speed. I currently ride a Trek hybrid and can average about 13.5mph on a good day!! I'm thinking about getting a road bike and have been told that would raise my average by about 2-3mph. I know that the younger/more athletic element can do 20+mph, but as a 47 year old female who's only been riding for 2 years, is my average ok??