I chose the Chi-Squared test because I am comparing two proportions. The limitations of the Chi-Squared test is that they are sensitive to sample size, but with nearly 200,000 observations I do not think this is an issue. Below are figures of my analysis:
Conclusion
Based on my analysis, I did not reject the null hypothesis that people born in the 80s use CitiBike at the same or higher rates than people born in the 90s.