Elton John, 77, says his two sons are worried about his old age: ‘I don't think I'm going to be around...'

Rockstar Elton John is worried that he will not be able to see the big moments of his kids lives. The 77-year-old rockstar has dominated the headlines recently for his new documentary Elton John: Never Too Late, in which he has talked aboutmanypersonalthings, including his two sons Zachary and Elijah.

In his documentary, John said that his two children,Zachary, 13, and Elijah, 11, are worried about his old age.

Talking about his kids fear, the singer says in the documentary, as per People, "They think about my mortality. They worry about my mortality."

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"Not so much David, but me," the Grammy-winner said, referencing his husband, David Furnish.

Further, the ''Hold Me Closer'' singer said that his two sons, "love their daddy, so they want me to be around forever, [and] I would love to be around forever."

The father of two saysthat he wants to see the big moments of his two sons lives. But being realistic, the singer addsthat he thinks that he's not going to be around for that.

"I want to see them have children and get married. I don't think I'm going to be around for that. Who knows?" John says. "You never know."

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"So that's why I want to use the best time — the best of my time — while I'm around," he adds. "Time together is so wonderful and so precious."

John and his husband, David Furnish, welcomed their first son, Zachary (13), in 2010 via surrogate, and their second son, Elijah (11), in 2013 via the same surrogate.

Elton John: Never Too Late was premiered at the Toronto International Film Festival. While addressing the crowd at Roy Thomson Hall, teary Elton said his family is more important than his fame.

“On my tombstone, I don’t want it to say he sold a million records. I want it to say he was a great dad and great husband,” he said.

Directed by R.J. Cutler and David Furnish, the documentary will premiere on Dec. 13, on Disney+.