Jeff,
We are really happy with your decision. You will excel at college. I can tell by your inquisitive mind and excellent writing style. Going to college as an adult may seem difficult, but in reality the professors and fellow students appreciate good thinking, effort and a willingness to learn. The only problem with starting college as an adult - in my opinion- is that you need to select a degree that has a high probability of a rewarding career. For instance, fields such as accounting and engineering and business sometimes lead to great jobs, but the large firms usually hire younger people and abuse the heck out of them and see who survives. If you survive you end up making a lot of money and have nice schedule.
You might want to look at degrees that end up with you on a level playing field with fellow graduates. A graduate degree in accounting (as a CPA) would allow you to hang up your own shingle or start in a smaller firm. A degree in education (with a certificate) would make you immediately employable. In many parts of the country there is a real shortage of teachers - I don't know where you live - at times if you agree to teach certain subjects or in certain areas your education will be paid for and paid internships are available.
Human resources is another area where being a little older may be an advantage. Many older hires are more slanted toward organizational development than HR. But in this field, experience is a plus, maybe even your Gilead experience.
Another avenue to consider is going all the way and pursuing a doctoral level degree. This would allow you to teach or research at a university. And while the time and expense can be tough, the end result can be very rewarding.
My last thought on the issue - with the limited knowledge that I have about you - is to pursue a degree and certification in speech pathology. You likely have excellent language skills, a good empathic listening style and a love of people - combining those skills would make you a great speech pathologist. They are highly employable and the pay is great.
All the best,
zarco