I think this would be quite a personal thing but for me 2012-13 was the last time things felt "okay". I was just finishing university, I didn't suffer the huge tuition fee increases so I left in fairly good health and with a manageable student debt. I found a decent job within a month of graduating. We also had the Olympics and Aguero in 2012 - national pride felt like it still might be a thing. I had some level of optimism for my future, and the Lib Dems seemed to be keeping the worst of the Tories in check. The economy was just starting to feel like it might move in the right direction again after GFC, that was around the time we got back to our pre-GFC GDP and the assumption was it would keep going up from there.
It didn't. Ten years later our GDP is basically the same.
Since then it's pretty much felt like an inexorable downhill march getting worse and worse every year...