If you want to improve your mile time, start by tracking your average running speed. This way you smash your goals.
The Average 5K Time by Age and Sex
Running Faster vs. Running Longer, Fitness and Cardio Benefits
How Fast Can A Human Run? - Performance Lab of California
Average Running Speed and Tips for Improving Your Pace
Average running speed as a function of age
A Pro's Guide to Running a Faster Mile
How to Run a Faster Mile 9 Ways to Improve Your Mile Time
The 12-Week Marathon Training Plan for Intermediate Runners
How Fast Can A Human Run? - Performance Lab of California
How To Improve Your Average Mile Time & Be A Better Runner
What's A Good Mile Time? Average Times To Run A Mile By Age + Sex
Walking speed for seniors: This is a lifesaver!
How to increase my running speed - Quora
What's A Good Mile Time? Average Times To Run A Mile By Age + Sex