Before the 61st Amendment Act 1989, what age was required by an Indian citizen for being eligible to vote in the election?

Before the 61st Constitutional Amendment Act of 1989 reduced the voting age to 18 years, Indian citizens had to be 21 years or older to be eligible to vote. The original Constitution (Article 326) set 21 years as the minimum age, which remained in effect from 1950 until the 61st Amendment changed it to 18 years in 1989. This was a significant expansion of democratic participation.