How Will My Writing Age?

I've been reading some Heinlein, lately. He's one of my favorite Science Fiction writers and I realized that there is still far too much of his portfolio I have yet to experience, and set out to fix that.

He's the sort of writer who, even for his less well-received works, I'm likely to come away glad I read it. He dwells upon many of the issues I find interesting, he was extremely smart, and did not seem to hold any ideals to absolutism (though there are many who would argue otherwise), so even when things get a little clunky in the execution I enjoy his work.

While reading Methuselah's Children, though, I find myself noting how the customs of his time have made their way into the future in a way that I would now find laughable. For instance, language that betrays the far more standardized gender roles of fifty or so years ago persists, even in a society he seems to be positing as possessing greater equality.

All this makes me wonder how my writing will eventually show the differences between my time and whenever the reader is from (assuming - with cheerful and unwarranted optimism - that people will be interested in reading my books after any significant span of time). What mores will it reveal that I myself don't even consciously know about? What assumptions? What biases?