Aggregate Household Spending by Generation, 2015

The Baby Boom controls a larger share of aggregate household spending than any other generation—35 percent of the $7.2 trillion spent by households in 2015. Gen X and Millennial households combined control 52 percent of aggregate household spending...

Aggregate household spending (and percent distribution) by generation, 2015
Millennials (under 39): $1,906 billion (26.5%)
Gen Xers (39 to 50): $1,858 billion (25.8%)
Boomers (51 to 69): $2,522 billion (35.1%)
Older (70 or older): $910 billion (12.7%)

Source: Bureau of Labor Statistics, 2015 Consumer Expenditure Survey