I noticed a few years ago that vintage Strats have horns that were more "rounded."
Is it my imagination or have the horns on the Stratocaster change over time?

I have some older Strats from 1996 through 2001 and it seems like the horns are a little "flatter."

It looks like the horns have become more like they were in the '50s.

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1975 Sunburst Stratocaster rosewood finger board
1979 Stratocaster with roseowood finder board
2001 Candy Green Clapton Stratocaster
2007 Andy Summers Inspired Telecaster
2007 '51 P-Bass
2012 Taylor 110
2015 Mystic Ice Blue Deluxe Stratocaster Plus

Post CBS, they were longer too. Now, depending on the specific model, there are indeed, differences. The same holds true for the cutaways.

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You dig?

I seem to remember that a return to what Fender called "vintage-style contours" was one of the updates they did when the American Series replaced the original American Standards. Of course this only applies to the "modern" models; the reissues were supposed to have contours similar to the "average" Strat of the given year (1957 or 1962).

Contours have been all over during the Strat's long history, plus individual guitars will almost always vary. In the old days (pre-CNC) there was probably a wider variance among individual guitars of a given year.

I just read about that today in a book I have on the Fender Strat. So it wasn't my imagination.