[semi-extrinsic]

I think the old style of pronouncing numbers still lives on, especially for two-digit numbers and in certain dialects/sociolects. I certainly use it without making conscious effort, and I'm a 90s kid. My children again understand the system, but they rarely use it.

[vidarh]

I mean, there are many other vestigial pieces that will hang in there for a very long time, but see elsewhere - I searched the National Library, and you're absolutely right that it's still around to a limited extent, but the decline in written use at least has been fairly steep.