Capitalization

Q. What is the proper way to capitalize (or not capitalize) “generation X”? Merriam-Webster lists “baby boom” and “baby boomer,” which I would normally take as a precedent, but it seems that “generation” should be capitalized because it precedes a single letter. Has this been decided?

A. Your instincts agree with American Heritage, the fourth edition of which (available through http://www.bartleby.com/) includes for this epithet the capitalized entry “Generation X” (as well as “Generation Y”).