This portrait at age 75 is Michael Leonard's "Lincoln Kirstein, Profile with Cats" from 1982.
Mr. Leonard (1933-2023) was an established British painter by the time this was done, but being associated with Lincoln Kirstein never seems to have hurt anyone's career. Three years later,
he painted the portrait below of Queen Elizabeth II with one of her Corgis.
And in between he painted this excellent male nude: