The gender breakdown and age structure remain fairly consistent in the period before 1930. Generally, about 60% of the immigrants were male. As to age structure, about 20% of immigrants were children, 70% were adults up to age 44, and 10% were older than 44. In most of the period and for most countries, immigrants were typically young single males, young couples, or, especially in the era before the steamship, families. For particular countries, such as Ireland, a large number of the immigrants were single women (Cohn, 1995).