I will be going to Tokyo as an exchange Student for the spring semester! What can I expect?

I will be going to Tokyo for the spring semester as a grad exchange student. I will be 27 and am a little afraid to be a little old when going to Japan. What tips can you recommend for finding friends, internationals and locals, to hang out with. Since I will go in spring? Is Tokyo manageable? What should I visit during that time? I already have been to Kyoto and Osaka in the past as a tourist! Would love to hear some stories from fellow grad students! Thank you