There are substantial differences in other aspects of the financial planning process that millennials consider important, such as choosing an advisor who has online advisor reviews—77% of millennials look for those, compared with just 53% of boomers.

And while the ability to make investment decisions via e-mail (32% of millennials want that, compared with just 13% of boomers) and websites (27% of millennials but only 4% of boomers) are important, the majority of investors still rely on the old-fashioned face-to-face and phone contacts with advisors.

But that loss of face time shows, according to the study: Just a third of millennials (33%) say they'd even recognize their financial advisors if they passed them on the street, compared with 65% of baby boomers.

And whether it's related to spending personal time with them or not, both millennials and GenXers have less trust in their advisors than do boomers, with just 49% of millennials and 50% of GenXers trusting their advisors to have their best interests as their priorities. Boomers, on the other hand, are more trusting, with 72% believing their advisors are looking out for them.

When it comes to an aggregated approach to viewing all their investments, only 32% of investors have access to one website that can show them everything. And almost half of investors remain tied to the decidedly low-tech data storage methods of folders, shoeboxes and other home storage options.