I am a 19 yo college kid, and I see a lot older Millennials and Gen X here. What are your stories in your careers?

I’m just kind of wondering how many people are over the age of 35. To me that would qualify you as an older Millennial. Is there any advice you have for people that just started or might just be going into the workforce? I know this sounds like what would be on r/askreddit but I’m pretty curious.