Distribution of CitiBike rider ages (20s or 30s) for June and December 2015, absolute counts. We can see from the chart that in total, there are more CitiBike riders in their 30s than in their 20s. We also see that there are lower total rides on Saturdays and Sundays compared to weekdays for both age groups. (color of 20s bars look slightly off from color of 20s label due to Jupyter Notebook display)