Is there any limit on how far light can travel -in a vaccuum that is.
Short answer: No.
No, light does not 'age' as it travels through the vacuum. We routinely detect photons emitted 380,000 years after the big bang [the CMBR].
Although there's no limit on the distance that light can travel, if some of the Dark Energy predictions are correct and space expansion is accelerating, there's a hypothetical stage where some parts of the universe are inaccessible from others-- Like the 'event horizon' of a black hole...
If light travelled for an infinite amount of time then would the wavelength not become infinite so that eventually you would need an infinite amount of time to "see" it?
No, there is no reason to think that the wavelength changes with time either.
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