A background like you describe could be easily worked into something in the Emergency Management arena.
With the large variety of chemicals being transported via road, rail, and everything else, the need for proper response to, and preparation for, chemical-related emergencies is high. There are a large number of FREE online courses that will teach you about all Emergency Management related issues. Within the field (depending on where you're willing to live/work), there are niches for specialists in manufacturing safety, regulations, emergency response, etc. Age is not a negative in this field!! Here's the site:
http://training.fema.gov/is/crslist.aspI "retired" after 18 years of police work, due to a bad knee injury. I enjoyed being self-employed, and made good money periodically, but lack of a regular paycheck can be nerve-wracking! After taking a load of these online FEMA classes, I contacted my local Emergency Management agency, and took on some volunteer work. Subsequently, when the Director moved to another job, he recommended me for his job, and here I am, Director of a county EMA department. Decent pay, great people to work with, mostly low-stress, until the you-know-what hits the fan...
http://www.wlfi.com/dpp/news/local_wlfi_carrollcounty_floodanniversary_200801081221 (Yeah, that's me in the red coat...)
Honestly, there are so many jobs in this field, it's amazing. If you're interested, learn how Emergency Management works in your area (or where you'd like to live!), and start making contacts in the field. Volunteer work is a great way to make friends and learn the system. Shoot me a private message if you like; I'd be glad to research your area, and give some guidance.