This is a bad precedent. I wish the Holy Father had stayed in office until he was at least bedridden, comatose or dead. Just because your health is not at 100 percent, is no reason for a Pope or a monarch like Queen Elizabeth to vacate the office. Give them a right hand man to help carry out strenuous diplomatic trips like the Queen has Will, Kate, Harry.
There’s always the possibility of intellectual decline due to age related reasons.