David Attenborough, started presenting TV documentaries in his late 20s. Patrick Moore was 34 when the first episode of 'The Sky at Night' was broadcast. Jeremy Paxman was 39 when he got the Newsnight gig. There's loads more.
Everyone starts young. Unless, in order to present intellegent programming, we should have some sort of minimum age of 56 in place, one has to accept that presenters, like policemen, soldiers and politicians, keep 'getting younger'.
I wish my (hypothetical) children could grow up watching Ivor the Engine and Bagpuss. That's achievable with the use of DVDs. So if young presenters are so offensive may I advise the documentary section on Amazon.
My apologies if this sounds abrasive but this constant belittling of 'young' presenters and idea that older presenters are being discriminated against because of their age bugs me. It's nothing new, and it's no different to any other industry, the young must filter through. (edited to correct grammatical errors!)