Living in northern Virginia, it seems like half of newly-constructed homes are earmarked for "active adult" 55 and up communities.

Is there a financial incentive above and beyond normal residential construction that these are popping up more?

It seems like a newer trend that's picked up in the last 5 or 10 years.

Edit 1: Thank you all for the input and sharing your perspective. It's just been a question hanging in the back of my mind as I've been driving around in recent months.

I'm relocating soon and trying to find the right spot for me. I don't want this to be an individual recommendation thread though. Instead, just tell me about your favorite urban neighborhoods — what you love about them, what isn't so great, and what makes them stand out from the rest.