Then we'd better hurry
All of the moonwalkers are starting to get up in the years and three of them are already gone. Of the 12 men to walk on the moon, we've already lost Pete Conrad (Apollo 12), Alan Sheppard (Apollo 14), and James Irwin (Apollo 15). I think all of the rest are in their seventies with the possible exception of Harrison Schmidt, who turns 70 this year.