Written, I sure, by somebody under 40. I'm 57. If the adverse affects may manifest themselves in 30-50 years then I would start being at risk at 87. Given my health, my genes, and medical science, barring any accident, I fully expect to live into my late 80's or even into my 90's. To blithely dismiss the risks to people in their 50's or 60's is pretty calloused. Perhaps you'll view your longevity differently once you're in your 50's.
You're being pedantic about it; if Harry Shearer is bringing enough value to Fox for him to paid $300k an episode, then he "deserves" it the same way a star athlete, who generates millions of dollars for his team's franchise, "deserves" the exorbitant salaries they make.
"Deserves" is really otherwise a very subjective term - and just because you don't think someone "deserves" something doesn't mean they don't, so it's pointless to argue about it.