Poor Emma, married to such an old man at twenty. However, she was an excellent mother to her only child and a good regent of her country, too. I think Wilhelmina was a very pretty little girl, as Amalia is now. I do think certain characteristics in looks have come down the generations in the Dutch royal family.
Indeed, and according to the story Willem at first intended to marry Emma's 3 years older sister Pauline.
At the wedding in 1879 Emma was twenty, while Willem was sixty one.
As mentioned Emma has been regentes for her underaged daughter. She was also appointed as regentes, when needed, for her granddaughter Juliana (from 1909 till 1927). As the government considered Juliana's father prince Hendrik not suitable.
Interesting fact in 1888 Emma's mother died, her father remarried in 1891 to Louise of Schleswig-Holstein-Sonderburg-Gl?cksburg, who was just 7 months older than Emma. Just like Emma, she was 41 years younger than her step son in law (who already passed away when Louise married Emma's father). The age difference between Louise and George Victor of Waldeck-Pyrmont was "just" 27 years.
King Willem III had the nickname King Gorilla