Never ever feel it is too late to go back to school. It's only too late when we cease to exist.
Earning a degree can be extremely empowering after all the lies we had to suck up growing up. At least for me it has been.
Access to higher education can vary greatly between countries. I was looking at coming to the States for a postgraduate degree and I was quite surprised to see that even at some of the top universities there were funding opportunities.
Also be strategic in your choice of study and don't underestimate your professional experience. This is definitely of interest to universities. At times you can even go straight from a Bachelor degree into a doctorate programme. New programmes are also being developed at excellent universities where large enterprises are sponsoring new degree courses and funding people to attend them. Even mature students.
So if you really want to get out there and give it a go, there is probably a programme out there for you. And if you need help, give a shout.
(For the UK, sites like this can be pretty useful for finding out about funding opportunities : http://www.prospects.ac.uk. If anyone knows of similar sites for the US, please share.)