baby boomer

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A person born during a baby boom, especially the one in the United States and Canada from the mid 1940s to the early 1960s.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A person born in the postwar years (generally considered in the USA and other Allied countries as between 1945 and the early 1960s), when there was an increase in the birth rate following the return of servicemen at the end of World War II.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a member of the baby boom generation in the 1950s