non academic job opportunities for mid aged PhD
Age here matters much less than the perceived seniority a PhD will grant you. 

I graduated at the age you plan to, and have had a straightforward time finding employment opportunities. Certainly, at all ages, having a PhD limits some entry level opportunities, as you are seen as better fitting 'senior' tracks. For these, you may not have sufficient 'real world' experience. If you have interest in rapidly transitioning from individual contributor role to management, this may not be a bad thing at all. The key, for me, has been being open with employers and flexible about role. 

Notably, this may somewhat depend on the culture in your field.