In a nutshell and for what ever reason, perceived or real (the jury is out) I would say YES.
My best astro mate and I, both in our mid 50's, have done several observing sessions from excellent dark and transparent skies, 1450m up in the Tindery mountains NSW under
Bortle 1/2 skies with an 18" F4.1 Dob and we have both concurred to being able to note weak rose and somewhat stronger green tones in bright nebulae including M42, M8 and M20 and green blue in bright planetary nebs, star colours are more vivid too, with perceptible rose tones visible in the brightest globs too.
Mike