I nominate Jeremy Irons.
https://www.imdb.com/name/nm0000460/
Age: 71
Height: 6' 1½"



Irons is of course a wonderful actor, who certainly can play the warm, fatherly old wizard - and also in a believable way be someone people can be a bit intimidated by, while the great kings and leaders can scoff at him and call him a scarecrow and bearer of bad news. He would be very good as both Gandalfs, the Grey and the White.
https://www.imdb.com/name/nm0000460/
Age: 71
Height: 6' 1½"



Irons is of course a wonderful actor, who certainly can play the warm, fatherly old wizard - and also in a believable way be someone people can be a bit intimidated by, while the great kings and leaders can scoff at him and call him a scarecrow and bearer of bad news. He would be very good as both Gandalfs, the Grey and the White.