(Disclaimer: I teach at a Mass. community college.)

I don't think you'll find too much difference between the community colleges in the eastern part of the state re: student demographics. Your best bet for finding older students is to look at night or weekend classes. Those classes tend to skew older as those students usually have full-time jobs during the day.

Plus, we're offering more classes for dual enrollment (i.e. high school kids) during the day, and you'll probably want to steer clear from that.