You wrote, "Science is all about overturning received knowledge."

Au contraire Aged Fald (a title of respect)! The mark of true science is that each sucessive theory refines the previous one, not overturns it.

Yes, and I went on to say, "If a theory is accepted by the main body of science you best know what you're talking about if you're thinking of overturning it."

And, while Fald and age are the lexemes in question, the latter has nothing at all to do with senectitude, irregardless of whether or not I am or am not a geezer or not.