Your approach should be the same as any (younger) person. No discrimination.

Three simple steps outlined in this blog post

Yes I can help you get an internship
http://creativeagencysecrets.com/yes-i-can-help-you-get-an-internship/

1. Learn how to write a formal business letter. Use proper sentences, punctuation and grammar. Capital letters for your name are important if you want to be taken seriously.
2. Do some research first on the business you are approaching. In your letter explain what you would hope to learn from the company and what you think you could contribute to them. Remember an internship is not one-way. So can you teach me? Your letter needs to be a sales pitch for YOU.
3. Read articles from our blog archive about Interns they will help you understand what Creative Agency Secrets teaches its interns.