There's more to it than that though.
People now seem to be buying houses with mature gardens and ripping out every living thing. It happened in the house next door to us, which used to be a woodland garden and was a haven for wildlife. I saw a post on here recently about someone buying a house and saying they planned to take out the trees and bushes. It's vandalism, pure and simple. Why not just buy a property with an already sterile garden if that's all you aspire to?
We live in a comparatively affluent north west village, the demographic hasn't really changed, there's always been a mix of retired professionals and a lot of young families.
It's not about age or status or financial stability in this area but it seems to be a modern mindset that nobody wants a garden. Peoples aspirations have changed.
I do think to some extent that it's about trends and social media. All the talk about making your garden a living area, "an extension of your living room". First it was decking now it's paving, outdoor furniture, hot tubs and astroturf, outdoor kitchens, fire pits. And lighting. The light pollution here now is insane, the birds sing all night because it's so brightly lit.
Thirty years ago when we moved here, this street was full of bedding plants, brightly coloured hanging baskets, gorgeous colourful shrubs in the front gardens (which are predominantly now paved over). The back gardens all had trees, everyone sat in their gardens, a lot of people had greenhouses and grew tomatoes. It was a lovely environment for little kids because of all the birds, animals, green spaces to play.
I'm talking here about working people with kids, in privately owned houses - that aspect has not changed.
So I don't believe it's anything to do with "not being able to afford plants or garden equipment". This is a place of multi car households and high property prices, designer clothes and gym memberships. A lot of people employ cleaners and dog walkers. I'm not talking deprived urban with no green spaces, I'm talking about an affluent north west suburb with footballers and multi million pound properties. It's a mindset and a fashion, it's not about money or "not having enough time".