David Attenborough has suggested children do not understand complete freedom because technology means they can never be "out of contact".
The 93-year-old wildlife broadcaster said his experiences of "getting lost" in his youth could not be repeated by teenagers today.
Speaking to Time Out magazine, the natural historian recounted how, in 1955, he got on a small boat and sailed east among the islands of Indonesia.
"Nobody knew where we were.” “There were no mobile phones."
Now, he says that young people will never experience the kind of freedom he had.
He said: "There's no way in which you can be out of contact."
Attenborough admitted to being 'terrified' when he became completely lost in the middle of a rainforest.
"The first time you go, it's quite a daunting business. You can't see the sun. You've got no way of orienting yourself," he said.
"You will easily get lost and I have been lost, and it's terrifying."
The BBC presenter added that if he could bring an extinct animal back to life, it would be a pterosaur - a flying reptile which lived among the dinosaurs.
"I would love to see a pterosaur," "They were the size of small aeroplanes."
"How did they flap their wings? How did it get into the air?"
Speaking on the devastating effects climate change is having on the planet, Attenborough recalled feeling horror when he saw a coral reef that had been destroyed by humans.
He said: “One of the most magical moments of a naturalist's life is the first time you dive on a coral reef. We were filming 'Blue Planet' and we got there expecting to see the most beautiful spectacle imaginable.
"We dived down and it was gone. Dead. Because of humans. I just felt... horror."