From typicallyspanish.com

Spanish Oddities
King Juan Carlos celebrates his 71st birthday quietly at home
By h.b.
Jan 5, 2009 - 7:19 PM

King Juan Carlos celebrated his 71st birthday on Monday quietly with his family, and carrying out his usual duties in his office.

It’s normal for the monarch to have a quiet day, although last year he did organize a grand gala to celebrate his 70th birthday in the El Pardo palace.