Question: The older sister of the Swedish actress born on July 7, 1981 started acting at what age?
Context: Sara Catharina Alström (born October 28, 1975 in Stockholm) is a Swedish actress.  She started acting when she was 11 years old, then together with her younger sister Hanna.  She studied at Balettakademien 1993–95 and Kulturama 1994–96 and later in New York City at Actors Studio and Stella Adler Studio of Acting. Ingrid Chatarina Larsson is a Swedish actress born on 2 April 1947 in Stockholm. Anna Åström (5 November 1990) is a Swedish actress born in Gråbo outside of Lerum.  In 2013 Åström plays along with actors Gustaf Skarsgård and Kevin Naz in the film "Us". Taies Farzan is an Iranian-German film actress who was born in Iran and thereafter moved to Germany with her parents at early age of 14.  She started acting on stage for some years until she started acting in films of Daryush Shokof in late nineties.  Her performance in the film "Hitler's Grave" by Daryush Shokof won her best acting award at the New York International Independent Film and Video Festival in 2011.  She became active also as a film producer with Tenussian Vaccuvasco and continued producing several low budget art films including Breathful and Hitler's Grave. She is active in acting in films in Turkey.Taies Farzan speaks English, German, Turkish and Persian fluently. Hanna Carolina Alström (born July 7, 1981) is a Swedish actress. Evelina Anima Simonaho is a Swedish actress born in Falkenberg 1984. Ali Ghorban Zadeh is an Iranian actor.  He became interested in acting at the age of 15.  He started working in entertainment in animation, and directed his first animated film at the age of 16.  At the age of 19 he started acting in live action, and directed yet another animation short film called Dokhtaram (My Daughter) at the age of 21, starring Iranian veteran actor Reza Kianian.  Though Ghorbanzadeh has not academically studied acting, but his vast resume and his wide spectrum of roles he has played makes him a recognizable name and face amongst Iranian audiences.  Ghorbanzadeh is a much sought-after actor among Iranian directors, though in recent years he has worked mainly with leading director Saman Moghadam (Maxx, Ghalbe Yakhi).  Together, Moghadam and Ghorbanzadeh have produced three features and two series. "Kajsa" Anna-Karin Linnéa Ernst, (born 4 August 1962) is a Swedish actress.  She started acting at the age of sixteen at Nöjesteatern in Malmö and studied at Teaterhögskolan in Malmö.  After graduating she worked for ten years at Helsingborgs stadsteater.  There she acted in several plays such as "Byggmästare Solness", "Spindelkvinnans kyss" and "Knäckebröd och hovmästarsås".  In 1982 she danced balet at plays for Nils Poppe at Fredriksdalsteatern, and in 1990 she played a role in the play "Två man och en änka" at the same theater.  She would appear in the filmatization of the play in 2013. Sophie Tolstoy Regan (née "Sophie Alexandra Tolstoy", born 25 March 1967 in Lidingö, Stockholm County) is a Swedish actress.  She is the older sister to the actor Alexander Tolstoy.  Tolstoy is best known for her role as Sara Beijer in "Beck – Hämndens pris". Pia Ingela Cecilia Frode is a Swedish actress born on 14 August 1970 in Linköping.
Answer: 11 years old