I am a 67 year old woman living alone. My neighbors are two young men in thier early 30’s that just moved in to the same house. We do Shabbat meals together with all the rituals. I was told that it is an Issur of Yichud, is it true?

Shalom U'veracha, If the interaction is during the day or in a place where other people can see, and definitely in a place where other people may come in and disturb you, there is no problem of Yichud. If both these young men are religious and you are with them both together it is also permitted. Kol Tuv