Not just millennials; got a letter from an Australian stay-at-home dad who's having the same problem, asking career advisors about infosec and getting blank stares.
Here's part of what I told him:
I came across this set of resources:http://www.asd.gov.au/careers/index.htm
...but notice that their apprenticeship page is 404, and their events calendar is empty. #FAIL!
Perhaps the Australian Information Security Association (AISA) might be a better resource for Australians:https://www.aisa.org.au/
And wherever you are, there are likely infosec meetups:http://information-security.meetup.com/
Short of that, I'd look to infosec professionals at wherever you hang out. Church? Synagogue? Anyplace you go that has a web presence and therefore a need to secure it and therefore (hopefully!) somebody doing that work?
Finally, what about your LinkedIn network? Or other social networks? Are you sure you don't already have contacts who work in the field, or whose spouse/relative/friend does?
LinkedIn is good for a granular search that lets you specify people who work in technology or even specifically in infosec. It also is a good resource for groups devoted to infosec. I just ran a LinkedIn search on infosec and the top three results were groups devoted to infosec jobs (and, of course, people talking about the field). The search also pulled up tens of thousands of people working in the field, along with job opportunities. LinkedIn is your friend: it might not lead directly to a job, but it can lead to groups to join, and people who can give you some insight about the field, including how to get into it, from first-hand knowledge.