As the United States celebrates its 250th anniversary this year, expect Revolutionary War and similar historical reenactments to receive new attention. It’s a practice that has gone on for more than 50 years, and one that many older people find is an active way to satisfy their love of history. “A lot of people started during the bicentennial, putting on uniforms and such,” says Bob Bendesky, 67, president emeritus of the 6th Pennsylvania Regiment living history group, based in Philadelphia. “Now those younger people are the older people.”