How far in the future [is your story set]? If it's five years or more, I would expect there to be some startling changes: perhaps in technology, perhaps in political alignments.
Twenty years: turn-of-the-millenium women's clothing appears in fashion magazines (or their electronic replacements) -- reproduced in much more expensive fabrics. Nostalgic tv shows about the 1990s. Historical romances set in the gentler, simpler time of the 1980s.
Fifty years: Discussion of American politics commonly includes nostalgic references to the 2000's -- when Americans agreed on basic political beliefs, and politicians (and others involved in public affairs; party volunteers, for example) were polite to those on the other side.
[No, I am not joking in the two previous paragraphs. And I am not using hyperbole.]