There is some disagreement as to the exact beginning and end dates of the baby boom, but the range most commonly accepted is as starting in 1946 and ending in 1964.[2][3][4] The problem with this definition is that this period may be too long for a cultural generation, even though it covers a time of increased births. If the gross number of births were the indicator, births began to decline from the peak in 1957 (4,300,000), but fluctuated or did not decline by much more than 40,000 (1959-1960) to 60,000 (1962-1963) until a sharp decline from 1964 (4,027,490) to 1965 (3,760,358). This makes 1964 a good year to mark the end of the baby boom in the U.S.[5]