However, just to set the record straight...

https://www.bbc.co.uk/news/election-2019-50765773?app=news.election.2019.story.50765773.page

From the above link...

”Labour, which has lost seats across the North, Midlands and Wales in places which backed Brexit in 2016, is facing its worst defeat since 1935.

I wasn’t born in 1935 so ‘in living memory’ works for me.