Call the benefits center for his pension. Ask every question, to EVERY scenario you can imagine...to include cohabitation, marriage etc. you both worked hard for the security you have today.
Make a list of pros and cons.....financial, and legal, not emotional. Remember you can take legal action for medical end of life decisions without being married, as well as any financial ones.
I just hate how all of that sounds, as at my core, I am really a romantic. I have a deep seeded fear of being a bag lady. That has been around long before I was married, or even met Big Guy for that matter.
Have a commitment ceremony if it makes legal, and financial sense.
I dunno, I'm a mess