I'm a millennial and I can't get my older colleagues to be vulnerable

Maybe work is for work?

There was an article a few months ago about how dress codes and standardization at IBM lead to better work and social relationships. Everyone followed the same work and dress code. It relived the stress of culture differences (race, religion, vulnerabilities, ect.) by focusing on the job at hand. They became friends because they didn't have to worry about social issues while at work.

Also back to the original article you posted, finding out that someone has a condition like epilepsy may prevent them from advancing in their career. You don't want to put too much stress on them because you never know when they could have a seizure. Even if they've been stable for years.

Its a job, not the center of your life. Broaden your life outside of work instead of trying to find meaning where there is likely none. Your boss is not your friend, and may one day need to lay your off for no fault of your own. What will you do then if your job is the center of your life?

And maybe you should stop trying?

As the other commenter wrote: work is for work. It is not a place for your personal issues. It's almost as if our language even has different words: friend vs. colleague.

If colleagues become friends, that's fine. However, if you only want to work with friends, that is unprofessional.

And of course, the whole "we're not a company, we're a family" BS is just a ruse to get you to put in extra time for free. If you're lucky.

If you're unlucky, they are actually so delusional as to think they mean it. They cannot actually mean it, because a company is fundamentally different from a family, and when push comes to shove, that nature will assert itself and many a tear will be shed as the illusion pops.