The revered thespian is currently starring in both Broadway plays, alongside his X-Men co-star Patrick Stewart, but he admits the vigorous schedule is becoming too hard on him at the age of 74.
He tells New York magazine, "I love working in New York, but it's not necessarily something I'd be able to do in five years time. I suggested to Patrick that we put it on the posters: 'Final performances in New York'. Oh, he didn't like that! But I know, for me, I won't be back. This is it."
MCKellen, who got his start in theatre in England, first hit the New York stage in 1967 in The Promise.