Pierce Brosnan
Pierce Brosnan became a grandfather early thanks to his adopted daughter Charlotte. The girl was only three years old when Brosnan began dating her mother, Australian actress Cassandra Harris, whom he married in 1980. Pierce officially adopted Charlotte and her brother Christopher after their father passed away and always treated them like his own children. Pierce and Cassandra, who died of ovarian cancer at the age of 41 also have a son named Sean.Jim Carrey
Jim Carrey is also one of those who were once both a young dad and subsequently a young grandfather. The Canadian actor and comedian welcomed his only child, daughter Jane, when he was only 25 years old. Jane was 22 years old when she and her then husband Alex Santana found out they were expecting a son in 2010.
Whoopi Goldberg
Whoopi Goldberg is a record holder among all the young grandparents, because her first granddaughter was born when Whoopi was only 34 years old. Goldberg gave birth to her first daughter Alexandria at 18, but Alexandria herself became pregnant when she was only 15 years old.Mick Jagger
Rock superstar Mick Jagger has eight of his own children, so it’s not surprising that he became a grandfather at the age of 50. Jagger’s daughter Jade was the first to gift Sir Mick with granddaughter Assisi.
James Brolin
James Brolin was only 47 years old when he first became a grandfather. James’s son, no less talented and handsome actor Josh Brolin together with his first wife Alice Adair gave birth to their first child when Josh was only 20 years old.
Charlie Sheen
Charlie Sheen also became a grandfather at the age of 47. One of the most famous bad guys in Hollywood and his high school love Paula gave birth to daughter Cassandra when they were both 19. Cassandra was 28 when she became the mother of her first child, daughter Luna in 2013.