I think that the old age dates should be taught as an 'intelligent guess', not 'fact'.
Well, in essence, that is in fact what
is taught in science classes.
A defining characteristic of science is that all findings are tentative.
Everything is subject to revision if new evidence comes to light, or someone develops a better theory to explain our observations.
Every time a scientist says something, by definition it includes the caveat, "As far as we can tell right now."
This is perhaps the most significant factor of science that distinguishes it from creationism. Creos begin and end with certain beliefs and hold those beliefs beyond the scope of questioning. A scientist will question anything, given an adequate quantum of evidence suggesting that the conclusion is wrong.
If from time to time someone teaching science omits the phrase "As far as we can tell right now," perhaps they can be forgiven because of the overwhelming weight of evidence in support of a given proposition and a complete absence of evidence suggesting the proposition is in error. However, if you ever hear anyone teaching that any proposition in a science class as an absolute truth, no longer subject to doubt, there's nothing wrong with pointing out to them that all of science is tentative. If they don't understand that most basic fact, they ought not be teaching science.
Those who would sacrifice an essential liberty for a temporary security will lose both, and deserve neither. -- Benjamin Franklin
We see monsters where science shows us windmills. -- Phat