You are absolutely NOT too old!  And I am not convinced you need an MBA to start your OWN business (my advice would be different if you were looking to work within a large fashion company). 

Why not start on your own?  Design and make one or two items - take photos - Sell them YOURSELF online (Etsy or one of those sites).  Have your friends take pics wearing your stuff and post them on Facebook/MySpace or other sites).  Understand that this may lead to people stealing your design idea (You can do an online search to see how you can protect your ideas.) 

Remember - the two guys that started the "Life is Good" T-shirts did it by selling those tee shirts at concerts.  Look up their story.  You can start in a similar way. 

You can do whatever you put your mind to.  Listen only to people who believe in you - you are young enough to take risks!  Go for it.

mhalligan@advantedgesales.com