My impression so far is that we've done a lot of work at the lifespan, less at the healthspan. What's the point of living until 90 if the last 15 years isn't that fun at all.
Contrast this with Denmark's lifespan growth over the same period, of 76.8 to 81.4 (+4.6 years) https://ourworldindata.org/grapher/life-expectancy?time=2000...
So from the data, prior to covid-19 Danes had gained about 3 and a half years of healthy life, and an additional year of unhealthy life.
It makes sense that Healthspan and lifespan are well-correlated, as most of the ways we have of extending lifespan do so in a way that makes you clearly healthier (such as preventing chronic diseases).
That said, it is true there is a bit of an increasing gap. This isn't just in Denmark, it's global - lifespan rose by 6.4 years from 2000-2019 while healthspan only increased 5.3 years. https://www.who.int/data/gho/data/themes/mortality-and-globa...
The metric I've come across is Quality Adjusted Life Years: