I can't speak for the whole city, but I know of three playground zones in the neighbourhood I grew up in that didn't exist when I was growing up there. None of them meet the provincial guidelines for a playground zone.
This one that I've posted before:
https://goo.gl/maps/DnOhU -- No direct access to any playground. The closest playground is more than a block away.
https://goo.gl/maps/HjcK3 -- Adjacent to a school, but the playground area of the school is completely fenced in and the entrance to the school is not along this road. The fence around the school yard is up a small hill and over 15m away from the road. The actual playground for the school is on the complete opposite side of the school yard from the roadway.
https://goo.gl/maps/Ncasj -- Again, adajecent to schools, but nowhere near the school buildings and nowhere near the one small playground that exists. One of the schools is a Jr High and has no playground at all. A fence runs adjacent to the road for its entire length and there is no direct access to either school from this road. This one is over 450m long.
None of these playground zones existed 25 years ago. None of them should be playground zones based on the provincial guidelines.