Question: S.Easwara Varma is a violinist who has accompanied an Indian vocalist who is one of ten musicians to receive the Madras Music Academy's Sangeetha Kalanidhi before they turned what?

Context paragraphs:
Trichur V. Ramachandran: Trichur V. Ramachandran(born 1940) is a Carnatic music vocalist.  He was awarded the Madras Music Academy's Sangeetha Kalanidhi in 2012.  This is the prestigious award from the Madras Music Academy.

M. S. Gopalakrishnan: M.S. Gopalakrishnan, a.k.a. MSG, (10 June 1931 – 3 January 2013) was a violinist in the field of Carnatic music.  He was awarded the Madras Music Academy's Sangeetha Kalanidhi in 1997.  He was a recipient of the Padma Bhushan, Padma Shri, Kalaimamani, Sangeetha Kalanidhi and Sangeet Natak Akademi awards, and is commonly grouped with Lalgudi Jayaraman and T.N.Krishnan as part of the violin-trinity of Carnatic Music.

M. Chandrasekaran: Sangita Kalanidhi Dr. M. Chandrasekaran is an eminent Carnatic classical violinist from Chennai, Tamil Nadu, India.  He was awarded the Madras Music Academy's Sangeetha Kalanidhi in 2005.  Sri M. Chandrasekharan's connection with music was firmly established over 65 years ago, when he began playing the violin at the age of 11, after which he went on to accompany many stalwarts in the field of Carnatic music.  Having lost his eyesight at the age of two, he overcame his difficulty by music.  Deeply appreciative of the importance of not just the lyrics, but also its melody and bhava, the prolific violinist is known for his success in bringing out the subtlest of musical nuances.  He is also considered an expert in the laya aspects, recognizing and adapting to intricate rhythmic patterns with ease and grace.  Sri Chandrasekharan also presents vocal concerts, and sometimes sings along during his solo violin recitals.  He has composed various musical forms in different languages, and has travelled the world performing, enthralling audiences all over.  He often performs violin duet concerts with his daughter Smt.  G. Bharathi.  He has accompanied several stalwarts and doyens of Carnatic music.

Maharajapuram Santhanam: Sangeetha Kalanidhi Maharajapuram Santhanam (Tamil: மகாராஜபுரம் ஸந்தானம் ), (December 3, 1928-June 24, 1992) was one of the greatest Carnatic music vocalists of the 20th century.  He was awarded the Madras Music Academy's Sangeetha Kalanidhi in 1989.  He was born in Sirunangur, a village in the state of Tamil Nadu.  He followed the footsteps of his father Maharajapuram Viswanatha Iyer who was also a Carnatic singer.

S. Easwara Varma: S.Easwara Varma is a carnatic style violinist and teacher from Kerala, South India.  Shri.Varma has taught in several music colleges in Kerala for over 30 years.  He is a regular performer in various music events held in the country, both as a soloist and as an accompanying artiste.  Easwara Varma has accompanied with his violin many greats in Carnatic music, like T.K.Govinda Rao, V.Dakshinamoorthy Swamy, Mavelikkara Prabhakara Varma, Neyyattinkara Vasudevan, Neyyattinkara Mohanachandran, S.Retnakaran Bhagavathar, P.R.Kumara Kerala Varma, Perumbavoor.G.Raveendranath, Dr.K.J.Yesudas, T.V.Sankaranarayanan, Sanjay Subrahmanyan, T.M.Krishna, Prof.K.Omanakutty, M.K.Sankaran Namboothiri, Vayyankara.S.R.Madhusoodanan, and K.Venkataraman

M. Balamuralikrishna: Mangalampalli Balamuralikrishna (6 July 1930 – 22 November 2016) was an Indian Carnatic vocalist, musician, multi-instrumentalist, playback singer, composer, and character actor.  He was awarded the Madras Music Academy's Sangeetha Kalanidhi in 1978.  He has garnered two National Film Awards (1976, 1987), the Sangeet Natak Akademi Award in 1975, the Padma Vibhushan, India's second-highest civilian honor in 1991, for his contribution towards arts, the Mahatma Gandhi Silver Medal from UNESCO in 1995, the Chevalier of the Ordre des Arts et des Lettres by the French Government in 2005, the Sangeetha Kalanidhi by Madras Music Academy, and the Sangeetha Kalasikhamani in 1991, by "the Fine Arts Society", Chennai to name a few.

Sanjay Subrahmanyan: Sanjay Subrahmanyan (born 21 January 1968) is a "Carnatic" vocalist from India.  He was awarded the Madras Music Academy's Sangeetha Kalanidhi in 2015.  This is the highest honour that can be bestowed on a "Carnatic" musician and Sanjay Subrahmanyan is one of ten musicians who have been bestowed this honour before they turned 50 years of age.

Alathur Srinivasa Iyer: Alathur Srinivasa Iyer (1911–1980), born in Tamil Nadu, was an Indian vocalist.  Together with Alathur Sivasubramania Iyer, he formed the successful duo known as the "Alathur Brothers", though the two were not in fact brothers.  He was awarded the Madras Music Academy's Sangeetha Kalanidhi in 1965.  A student of Alathur Venkatesa Iyer, Srinivasa gave his first performances when he was ten years old.  From 1944 to 1968.  He was a court musician for the Maharajah of Travancore.  He lived longer than his partner, Alathur Sivasubramania Iyer and performed many solo concerts after the death of Sivasubramania Iyer.

Palghat Mani Iyer: Palghat T. S. Mani Iyer (1912–1981) was one of the leading mridangists in the field of Carnatic music.  He was awarded the Madras Music Academy's Sangeetha Kalanidhi in 1966.  Mani Iyer was the first mridangist to win the Sangeetha Kalanidhi and Padmabhushan awards of the Government of India.  He received the Sangeet Natak Akademi Award in 1956.

Sangeetha Kalanidhi: Sangeetha Kalanidhi or Sangita Kalanidhi (Sanskrit: saṅgītakalānidhi ) ("sangeetha" = music, "kala" = art, "nidhi" = treasure) is the title awarded yearly to an expert Carnatic Musician by the Madras Music Academy.  It is often considered to be the most prestigious award in the field of Carnatic Music.

Supporting paragraphs: S. Easwara Varma Sanjay Subrahmanyan
Answer: 50 years of age