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If an experience is "significant" you can include it. At issue is whether an adcomm will regard any activity from so long ago, unless the activity continued into the college years. So if you have recent formal shadowing, you can add the HS shadowing into the same space, giving the date span separately in the narrative and totaling the hours. With the research activity, it would go in its own space, if you feel it's important enough to bring up, but probably not if you have no more recent research activity.What is the "oldest" experience that can (or should) be listed? I had two mentorships in high school where I got 100+ hours of shadowing experience as well as independent research. This was 6 years ago and I'm not sure if I should mention these as part of my shadowing experience. They helped me confirm my desire to continue in the direction of medicine when I first started as an undergrad...