India, May 27 -- A brilliant two-year-old boy from the UK has become the youngest member of Mensa, the largest and oldest high-IQ society in the world, Guinness World Records said in a report. To join the exclusive club, one must be in the top 2% or have an IQ of at least 132. Joseph Harris-Birtill was officially welcomed into the club at age 2 years and 182 days, becoming the youngest male Mensa member, second only to Joseph Isla McNabb, who was 2 years 195 days old when she joined.

His parents, Rose and David Joseph Harris-Birtill, are lecturers at the University of St Andrews. The couple said their child has always been advanced for his age, right from birth.

"He first rolled over at five weeks, said his first word at seven months, a...