Sir David Attenborough struggles to understand his own popularity among young people.

Sir David Attenborough

Sir David Attenborough

The 93-year-old documentary-maker - who is outspoken about environmental issues - admits it's "odd" that he's so widely revered by young people in the UK.

He reflected: "It's very odd. But the fact remains I've been at it 60 years. You can say nobody under the age of 75 can have been without my voice coming from the corner of the room at various times and that must have an effect.

"It's a huge advantage for me because you go there with some sort of reputation and people are aware of you, and in a sense you've been part of the family for quite a long time, which is an extraordinary obligation really and a privilege.

"I'm sure there's a hell of a lot of young people saying 'for God's sake why don't they move over, give the others a chance."

David also admitted that attitudes towards the environment have evolved over recent years.

He told the BBC: "I don't think I've made a series in the last 40 years where I haven't made the end an appeal about caring for the natural world.

"Its an extraordinary thing. At the time I daresay people thought we were sort of cranks or something.

"But as it's gone on and on and on and we've repeated it on and on and on - 'not wasting things, not polluting things' and so on - suddenly you hit the right note."