Comment by taylodl
I know people in their 60s who are senior engineers and are quite content with their career and where they are. I know people in their 30s who are directors. It really depends on the person and where your talents and strengths lie.
The key, though it's admittedly easier said than done, is for you to do you and not worry about what everyone else is doing.
It's fun until your boss makes you hire and lead a team, as well as be product manager, and head of QA (you are the QA), and basically become the director of a department, while still holding the title of "Sr. Engineer". I didn't really ask for any of this, and I'd be happy if I were still just doing "Sr. Engineer" work, but there's a lot on my shoulders. While this sounds shitty, I also have autonomy and job security.