A Hindu girl aged 22 years marries her maternal uncle's son aged 21 years under the Special Marriage…

The marriage is null and void because a maternal uncle's son falls within the prohibited degrees under the Special Marriage Act, 1954. Section 4(d) prohibits such a marriage unless a qualifying custom permits it, and section 24 makes a marriage contravening that condition void. Both parties meet the stated minimum ages, so age does not cure the prohibited relationship.