Re: King Michael I of Romania: IMO, he has "carried his years well." People often remark how much he physically resembles Queen Elizabeth II's father, George VI. This is only natural as they are/were both descended from Queen Victoria. A comment is made from another source to the effect that had he continued to reign (from the time that he first came to the throne, 1927), he would be the longest reigning European monarch, even surpassing France's Louis XIV !
Additionally, had King Simeon II of Bulgaria (also a cousin of Elizabeth II) continued to reign from 1943, he too, would surpass Queen Elizabeth II's regnal years.
Both of these (former) monarchs flanked Queen Elizabeth II in the recent Windsor group photo: HM Michael I to her right and HM Simeon II to her left. Regards, AP.