I'm a software developer in my mid-20s and I subscribe to and regularly watch videos on YouTube. It's probably in the top 10 most visited sites for me.
I mainly subscribe to woodworking and programming channels. It's generally something where I'm hoping to learn new skills and techniques, and for that, YouTube is incredible.
I also purchased my first home last year (100 years old) and channels like This Old House have been incredibly helpful with many maintenance tasks.