By that age, I was into my third long-term job (> 5 years) and had had upwards of 16 short term ones - multiple part time ones at once, or some just for a few weeks or a couple of months here and there between the long-term ones etc.

48 doesn’t seem that unlikely - nor even an indicator that they will not be staying put for any length of time unless your job is a shitty one with a high turnover anyway.

Doctor who (2005) s01e07 - Kronkburgers on Satellite 5 in the opening scenes.

Without looking for sources - so I could be totally wrong - I believe that it did darken proportionately and that light meters would register that. However, human eyes are not light meters and adjust to the dimmer light without you knowing.

I don’t know whether it was you, but I have responded to this same question on Lemmy before.

Yes. We had a coal fire when I was growing up - in the 60s and 70s -, so it was an everyday thing during the winters.