While that cited census data might say that 1 in 3 residents is 20-35 and does not have a car, that means that the other 2/3rds of the residents are outside that demograph and most of them (especially those 36+) probably do.
That demograph is also more likely to be married and have kids, I would think. As an old fart with a wife and kids, I can also say that I do a lot more consuming now than I ever did as a bachelor--simple math, I now have 4 mouths (and counting) to feed/house/entertain vice only one.
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I say all this because not having a car works well for some. But if you have ever tried lugging more than a couple bags worth of groceries around more than 50 yards under Sunny, dry 68 degree skies, it's a chore. Try doing that earlier this afternoon when it was 95 and humid, or in February with 3 feet of snow and the sidewalks not plowed for 5 days.
Or if you have to commute beyond your den and show up resembling a semi-professional appearance (particularly if your place of business has no locker/shower facilities), it can be tough relying on bike/public transit. Shoot, my office is in Wilmington and I live in Dedham. If I leave early enough, it is a 40 minute ride in to work. If I take the commuter rails (yes, one into Back Bay/South Station, one out of North Station to Wilmington) and get a friend from work to pick me up 2-4 miles from my office (depending on which train I catch), the whole event can last upwards of 2.5 hours EACH WAY.
My point is that a car can be a lot faster, and I have found that as time passes, the more important it becomes. Yes, with traffic, there are definitely times where public transit is a quicker option; however, I'd still take a car if I had a couple of young kids and/or a bunch of groceries to lug around.
So not everyone that has a car is an entitled nuke the whales antichrist . . . many are just busy raising a family
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P.S. Yes, I live in Dedham, not Boston. Wife wouldn't go for living in the city and it wasn't a hill worth dying on. Perhaps that DQs me from having a valid opinion, but 15 years after the fact, I see her wisdom and am actually more inclined to live further away from the city than closer to it.