I'm in my second year of uni and one of my profs that taught me last year is going to retire after this fall semester (~jan). I know this person really well and I was hoping that she'd be around when it was time to apply to med school so I can ask her for a LOR. And since I won't be apply for another 2-3 years, would it be okay if I get her to write me a LOR and upload it to interfolio maybe and I can then use it down the road when its time to apply to med schools. Would this be a problem for adcoms?