Keep in mind that the US can immigrate away the age demographic more than Japan.
From the economist.com
Hamilton didn't need to get approval to immigrate, practice law, or open a bank.
From the economist.com
When did the first ancestor of Jeff Sessions immigrate to America and from where?
From the sacbee.com
Their mother and a younger brother live in Yemen but hope to immigrate in 2012.
From the thenewstribune.com
He got a waiver to immigrate the next year and became a legal permanent resident.
From the usatoday.com
She was a generous woman who helped more than two dozen relatives also immigrate.
From the orlandosentinel.com
Let's just start letting people immigrate if they buy a house before arriving.
From the economist.com
Thousands immigrate to Palestine under the influence of Messianic predictions.
From the en.wikipedia.org
There are many ways that people can come into the US to work, travel and immigrate.
From the evangelicaloutpost.com
More examples
Migrate to a new environment; "only few plants can immigrate to the island"
Introduce or send as immigrants; "Britain immigrated many colonists to America"
Come into a new country and change residency; "Many people immigrated at the beginning of the 20th century"
(immigration) migration into a place (especially migration to a country of which you are not a native in order to settle there)
(immigration) the body of immigrants arriving during a specified interval; "the increased immigration strengthened the colony"
(Immigration (Show Ya album)) Immigration is the fifth album of the Japanese rock group Show Ya. The album was released on November 5, 1987 in Japan. Yasushi Akimoto and Tsutsumi Kyohei worked together again in song composition. ...
To move into another country to stay there permanently
(immigration) The act of immigrating; the passing or coming into a country for the purpose of permanent residence
(IMMIGRATION) To enter and settle in a country or region to which one is not native