Hi Liz,
You say you have 10 years experience in administration.
if you have that much experience in your field, that is as good as a degree. A degree is only any good if you do not hav the relevant experience for the job role, but it shows you have a willingness to learn and take information on board.
You ave proven your skills for 10 years and are still employed for what you are doing.
I would suggest visiting
www.musicweek.com and sign up, maybe subscribe to the magazine, and also, order either the Music Week Directory, or the Unsigned Guide.
These 2 books are filled with contacts and information about companies, and are an invaluable asset to anyone who works in music.
As for your age... that is irrelevant! :)
All the best.