I use 5-digit years in selected contexts (e.g. this blog).
4 July 02012 is 236 years since 4 July 01776.
It’s possible the United States of America will still exist in year 10000 (ten thousand). Year 10,000 is the first year requiring 5-digit year format. The 5-digit year format will be good up through year 99,999 (ninety-nine thousand nine hundred ninety-nine).
If the U.S.A. was a person, then 236 years of age compared to 10,000 years of age makes us a 2.36-year-old (i.e. we’re in our terrible twos).