The FAA brace position recommendation HAS changed, but it sure has not been twenty years since it was changed: the current recommendation came out in 2003:
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Well I started flying with an infant in 1991 and even then they did not advise me to do that including a rough landing in 1992 where the went over the emergency brace positions. And personally came to my seat and went over what to do. I mentioned 20 yrs because that is how long ago the accident that everyone always quotes happened.