I'm in a similar situation. My first degree was in Finance and I'm currently getting a second degree in CS.
I'll be finishing my degree this fall and will be 31. I work in Finance now in a sort of 'tech-adjacent' systems analyst and business intelligence position.
If I remember, I'll follow up this post in a few months with how my job search is going. I'll begin searching around June in the Philadelphia area.
I had a few interviews last year and have gone to one or two tech meet-ups, and I'm reasonably optimistic that my age won't be much of a deterrent. Most people I've spoken with like the diversity of my background and the obvious passion I have for CS. In a sense, going back to school while working full time is an "actions speak louder than words" situation. It takes a lot of effort to get through a second degree while working full-time, and I think that speaks for itself in terms of work ethic and interest in the topic (though it doesn't hurt to highlight as well).
That being said, I still have the nagging fear of ageism affecting my job prospects. I think my work experience will lend itself well, but I'm going about this without ego. I know I'm trying to break into a field competing with many other people, so it's probably going to be a numbers game in terms of applying. I'm also a little concerned about the Philadelphia tech scene as it's not as robust as one would expect for a city this size.
I know this isn't advice, as I can't offer much, but I can commiserate in having similar feelings and concerns. My guess is that your background will ultimately assist your search (though obviously not everywhere). The one piece of advice I can offer is to start applying early, if only to get interviewing experience and knock off the rust. You said you've been in your current role for 10 years -- has it also been 10 years since you've had a proper job interview?
If you want to chat further or even just bounce ideas around, I'm happy to chat further. What city are you based out of?