The life expectancy in 1900 was just 47 years.

In 1900, the life expectancy was 47 years of age. Only one person in 25 had then survived to age 60. Women lived shorter lives due to childbirth.

In the 1990s, the population growth rate for senior males is outstripping that of senior females, according to Census Bureau data. The male population over the age of 65 increased 11% between 1990 and 1996, while the female population increased 7.5%. During the same time period, the number of men in the age group over 85 rose 27 %, compared with 24 % for women. The ratio of women to men in the age group over 85 narrowed from 3.1:1.9 to 3.1:1.95. Women still dominate the population over 65, but the gap is beginning to narrow. In 1990, women accounted for 60 % of the population over 65; by 1996 that share had declined to 59 %, a notable change in a population of this size over this short period. The increasing number of men in the seniors' housing market could affect developers significantly, particularly in the amenities sought. An increased availability of health care for older Americans through the emergence of Medicare is cited as one factor in the increasing longevity of men, as is a decline in cigarette smoking among older males.