Was this ever solved?

I'm having exactly the same problem.
Need to fade particles over time(age).
Any ideas?

One issue I'm having with this volume light technique is the hard and visible noise around the light-sources. Have been playing with most of the settings but even oversampling a lot still gives me way too much noise. Any ideas of how to reduce or smooth this noise in the render (not post) would be ...

If used in a moving camera: make the box with the scattering material large and place it just "inside" the camera view (a couple of cm). Link it to the camera and make sure it covers whatever light that will be passing through it. This will get rid of any clipping issues.

Thanks Azen for your feedback and for looking into this.
You are probably right for the gamma, as this has not been handeled throught the camera properties after 2.24.2 - 2.16. Seems to work using a regular camera and adjusting the gamma through the Render/Camera tab.

Another issue I get with the 3 ...

Hi.
In the 3.14 TEST release I'm getting a strange behaviour on the Exposure settings in the Octane Camera.
If I set the exposure to 50 and save, the next time I load the scene it's basically cut in half, giving a darker image.
If I save again, and reload, value is cut in half again on the next load ...