It is important that researchers study motor development across the life span, especially into the later stages of an individual's life, because it is estimated that by the year 2030, of the population in the united states, china, russia, australia, and canada and the majority of the european union countries will be aged 65 years and older.

13%

Explanation:

According to my research on population studies, I can say that based on the information provided within the question it is calculated that by the year 2030 about 13% of the population of those countries will be aged 65 years and older. Studying motor development might help governments in making decisions and developing programs to help the elderly.

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