I am a 27 year old programmer and have worked for two small companies ( < 20 employees ) and for one company of 200+ employees. The only thing I can say about working for the large company is that it felt like breathing through a straw. Go work for a small company or as Paul Graham suggests, go start up your own. Leave the big companies for the burnt-out folk with kids and debt.
Ultimately though, the money I've saved will afford me the opportunity to strike out on my own. I certainly don't knock small companies, or starting your own. I just think large companies (OK, at least google) can be a great way to start your career before moving on to other stuff.