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In summary, population aging in Italy will become even more pronounced. Yemenis will also see their average age increase, although they will still be significantly younger than Italians were even in 2000.

In conclusion, population ageing in the US and Sweden can be said to be relatively similar. Japan on the other hand has had a complete different trend, with a relatively young population throughout the second half of the 20th century, but one which is expected to age dramatically in the period up to 2040.