Excellent question Tanya! I know when you are young, five years seems like eons ago! But, when it comes to careers, it is still a short while ago. I don't know much about marketing, so let's talk about law. If I was going to be considering hiring you as a Legal Assistant, Paralegal, Case Manager, etc. in a law firm, and I was reviewing your resume, and saw that you had experience, the first thing I'd want to know is NOT what experience you have. It is: who trained you? Whose tutelage did you come up under? Is it someone ethical, or one of those lawyers known for taking shortcuts and taking only big-money cases? I'd want to know that your foundation was solid, because I can always build upon it if it is. And this is why I want to know: where did you work five years ago?
Hopefully you will be able to show a progression of experience, perhaps starting out as a receptionist and working up to discovery. That is another reason to include it. Try to show the type of firm/types of cases that you worked on. If your more recent experience includes things that you did at your earlier internships, you want to go into greater detail at the more recent ones, and brief summaries for the older ones.
Keep in mind that lawyers, like most people, don't like to read. Keep it short. Try VERY hard to keep it to one page. Do not get creative with a law resume, but you can with a marketing one! Also remember to highlight your technological skills - it's really important in a law office!
Best of luck!