If they were in law school, and you worked in an area that's relevant to what you're doing, or they were with a prestigious firm or a judge, you need to list that all the time. But if you worked for a great firm after that or you got very good experience, it may not be necessary to list it. But one thing is a lot of large law firms will expect you to have had a summer associate job in the firm. And if you haven't, they may wonder why you were not interested in being a summer associate. So, you can include that, as well. That's up to you.
You should list legal internships if they're relevant. For example, I did a summer job in Washington, DC. I did not do that with a law firm, but with the government. I just left that on my résumé. But was it a good idea? More than five years ago, you probably don't need it unless it's related to what you do.
One example I would give is I did an internship with the Department of Justice but in the Environmental section. I probably shouldn't have left that on when I was applying to work in law firms because environmental is not really related to what I was doing. So, it's up to you. But you should be careful in the internships also. You need to be careful about what kind of organization it is and so forth.
