Would studying abroad senior year lessen chances of getting into Ivy League/MIT etc.?

And fwiw, my daughter studied abroad in Japan for a semester and it’s the best thing she ever did. Do it.

ETA: One of my students studied abroad for his entire junior year of high school. He loved every minute, speaks two languages fluently, in addition to English, and wishes he could have stayed longer.

Your youth is so fleeting. Seize the day, @altacct .