• Negative population growth = this occurs when the number of people dying is greater than the number of new births; e.g. in Australia negative population growth is balanced by immigration such that 25% of the population are born outside of the country.

• Address the problems = pay attention to the issue, look at the situation; e.g. by failing to address the problems within the US economy earlier the government has made matters worse

• Average life span = the normal, usual, expected time a person or organism or object lives for; e.g. the average life span of the Great Ocean Turtle is 60 years

• Marginalized and undervalued = put on the outer position, no longer appreciated or given attention; e.g. after he spoke up at the meeting against his boss the worker was from then on marginalized and undervalued at the company

• Broach = to open up a subject for discussion; e.g. they failed to broach her bad habits and the marriage ended in divorce

• Gerontology - the study of the social, psychological and biological aspects of aging.

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