William H. Frey says age of senior citizen status a "gray area"
NIA Aging Centers News Reference
Who qualifies as a "senior citizen"? As William Frey suggests here, as the 80 million or so Boomers reach retirement age, the status of seniorhood may be somewhat of a moving target. For example, marketers may stretch their intended audience age limit, or businesses may follow Social Security's lead and raise the age for discounts.
"'Seniorhood' a moving target" - Toledo Blade. 2/19/2012.