Siw Gunnel Margareta Malmkvist is a Swedish singer and actress born on December 31, 1936, in Landskrona, Sweden. Based on your words, you appear to be asking about her age as of today.

• As of today (November 14, 2025), Siw Malmkvist would be 88 years old, turning 89 on December 31, 2025.

If you’d like, I can provide more details about her career, notable songs, or appearances.