Once his daughter Jane gave birth to Jackson last February, Jim Carrey’s life changed…for the better!

“[I] love being granddaddy, granddaddy Jim,” Jim reveals to Access Hollywood. 

But, he admits it’s not quite a conventional title for a 48-year-old. “It’s very odd,” Jim confesses. “It’s not something I expected at this age to be.”

Nonetheless, Jim describes his 8-month-old grandson as “just magical…I just get a lot of joy…from that little boy.”

“It’s the greatest feeling in the world and as you get older,” he continues, “Your connection to these things gets so intense…you just go, ‘Without this, I die.’”