It is being called the $8T longevity bonus: it is an attempt to quantify the national value of all the hours volunteering and charitable donations that retirees of every echelon will contribute.
"You might assume that the wealthier segments of retirees are the most generous. You'd be wrong. Retirees at all income levels give, and those with the lowest and highest incomes give almost equally, in terms of percentage of their household income (see Figure 2). In addition to money, Americans contributed 7.7 billion hours through volunteering for charities, nonprofits, and causes."--Ken Dychtwald, Huffington Post