A light sail could get a probe (or a crew) to Alpha Centauri in 40 years. Nowadays it’s down to engineering and having the capital to do it, not fundamental physics. I’d be a little worried about sending anyone there, though. The very fact that he volunteered would necessarily mean he would have to be out of his mind.
I don’t know about that. Some people would volunteer just to get some peace and quiet or a subsidized purpose in life and death. Some people commit crimes just to get back into prison.
40 years ship time. A milenium Earth time.