I have sent emails to some startups asking if they will hire new grads, but none of them say "yes"; they are more interested in senior developers...
Indeed, on their websites, there're no positions available for new grads, but they also suggest if you are interested in our company, please contact us. That' why I sent the emails. Does this imply they only need senior developers who are interested in their company?
Startups often like to hire young people for various reasons but in a company that has 2 or 3 employees, everyone has to carry their own weight -- they usually cannot give you a lot of on the job training.
One trends I have seen is companies who hire young people to make cold calls; often these people have a PMA and some sales skills, but they don't understand the offerings they are selling well and don't have a complete set of sales skills.
An established company with name recognition and a well-worn playbook can get away with that, but I see many small (<25 employees) companies that struggle because there are two kinds of people you can talk to: (1) busy people and (2) people who will talk all day and never buy anything. Since you get one chance to make a first impression, an initial contact with a poor salesperson can be a very bad thing.
Don't ask "do you hire new grads?" because the real question is "will you hire me?" which can have a different answer if you communicate that you can bring something special.