I don't think they're planning to retire, but they're aware that anything could happen at any moment in their age. So if everything goes okay, they will continue, but if it doesn't, Run for Your Lives will serve as a good farewell tour.
I think that's why Bruce started touring solo - to (re)build his reputation as Bruce Dickinson, not as the Iron Maiden singer. He could have waited a few years, and taken some time off, but he has spent a lot of time performing under his own name. If Maiden retires soon, there will be a big interest in his solo shows and albums since the recent tour was satisfying.
So while Maiden might retire relatively soon, at least 3 members of the band (Bruce, Steve, Adrian) most likely won't.
I can't really see them making new music and not promoting it. They seem to be more into playing live than writing music.