The Boston Globe is reporting that the latest US Census shows that Boston has the highest ratio of 20 to 34 year olds among large US cities. With more than 1/3 (35%) of the city's residents falling into this age range. This represents an 11% jump from the figure reported one decade before.
Interestingly, the large number of young men and women living in Boston does not translate into having a great nightlife. As a matter of fact, my theory is that Bostonian conservatism combined with a large university population has contributed to many of the city's laws that restrict public drinking and require bars to close at 2AM.
However, this demographic does provide a lot of energy and vitality to the city which is evident whenever you walk around the streets of Boston. Other cities with high ratios of 20 to 34 year olds include: Austin and Washington D.C., Seattle, and San Francisco.