Rubbish. I am 41 and getting my PhD. Going back at 30 actually puts you at an advantage. Teachers like mature students because they take their studies more seriously, they are not there to party, and due to their wealth of expedriences in life they ususally have more to contribute to class discussion, they are more interesting students! It is not too late, it is so not a waste of money and getting a job easier will be easier I would think, rather than harder. Going back to college after your twenties displays a fair amount of grit, initiative, courage and determination, qualities that I would appreciate in any potential employee.
Go back and make it work for you. Gaining knowledge and skills and becoming a more useful, better informed citizen is only ever a good thing!!
Clare