From a Chain Store Age online release:

According to a recent survey of 1,000 U.S. consumers from advertising platform Criteo, 48% of millennial and Gen Z respondents use online grocery delivery services, compared to 37% of Gen X respondents and only 30% of baby boomer respondents. 

Baby boomers are much less likely than younger consumers to participate in a particular omnichannel grocery activity.

Results for browsing multiple sites to read product reviews are essentially the same across generations. But Gen X consumers are much more likely to browse multiple sites if a product they want is unavailable (37%) than Gen Z/millennial (28%) or baby boomer/silent generation consumers (22%). And more than half (51%) of baby boomer/silent generation consumers will browse multiple sites for none of these reasons, compared to 27% of Gen X and 15% of Gen Z/millennial consumers.

To read more: https://chainstoreage.com/survey-boomers-dont-say-ok-grocery-service