I'm a developer in my late 40's. Just like a LOT of other developers, I have a stackoverflow profile, a set of (active) personal Github repos, and a presence on LinkedIn.

I love clear, to-the-point video instruction. I don't think it's age-specific, but I really like "Tech World with Nana" on Youtube: https://www.youtube.com/@TechWorldwithNana

Hacker News (this site) is where I follow industry trends, along with Ars Technica, and TechCrunch. Again -- nothing out of the ordinary.

What might be unusual to younger devs is that I really enjoy mentoring. It reminds me why I got into this business, and sharpens my communication skills. I would encourage any senior dev or manager to seek out mentors to work with.

Oh! And don't be afraid to pick up hobbies. I picked up guitar, camping, and weight training in my 40's. You're never too old to learn something -- it starts with a choice.