In general, a city is more walkable and dense the earlier it developed. NYC and Boston are walkable cos they're old. Parts of Chicago are, but it did most of it's growing post-car so most of it isn't. LA did practically almost all it's growing post-car and so is awful for walkers.
It's the same in Europe - most of London is walkable because it hit a multi-million population pre-car. Milton Keynes is a concrete car-jungle because it only developed post-war.
All smelled of fresh paint and wet concrete. All were built with the intent to be walkable, and all are wonderful places to live. I never felt the need for a car once. What matters is not the age but the intent of the designers.