I’ve gotta admit, I’m slightly intrigued by this:

[url]<LINK_TEXT text="https://www.bbc.com/future/article/2025 ... -lungs-are">https://www.bbc.com/future/article/20250908-the-simple-test-to-check-how-old-your-lungs-are</LINK_TEXT>

[quote="MrHCinDE"]I’ve gotta admit, I’m slightly intrigued by this:

[url]<LINK_TEXT text="https://www.bbc.com/future/article/2025 ... -lungs-are">https://www.bbc.com/future/article/20250908-the-simple-test-to-check-how-old-your-lungs-are</LINK_TEXT>[/quote]

I recall trying something like that FVC test with a 5 liter wine jug a few years ago... no 200 ml markings... and was able to expel all of that.

If 3 to 5 liters is "average" what is good or excellent?

I just tried the slow exhaling test. I got 69 seconds on my second try.