The projected number of people aged 65 and over in the U.S. population with Alzheimer's disease (in millions) is given by

P(t) = 0.0002083t³+ 0.0157t²- 0.093t + 5.2(4 t 40);

Where t is measured in years and t = 4 corresponds to the year 2014. This model does not claim validity for years 2051 and beyond. Nevertheless, the model does suggest that:

There is no way to predict how this population will compare in 2050 and 2051 based on this data.

The number of people aged 65 and over in the U.S. population with Alzheimer's disease will likely be greater in 2051 than in 2050.

The number of people aged 65 and over in the U.S. population with Alzheimer's disease will likely be fewer in 2051 than in 2050.

The number of people aged 65 and over in the U.S. population with Alzheimer's disease will likely be approximately the same in 2051 as in 2050.