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He recently returned to royal duties, but the insider says it’s been difficult.
“He does perform in public, but that is for shorter periods of time.”
They added: “He is often brought in by helicopter and then taken out again. After a fight he needs a good rest.”
As RadarOnline.com previously reported, he was given just two years to live after being diagnosed with pancreatic cancer.
As for the future, a state funeral isn’t the only thing on Charles’s mind. An advocate of modernizing – and slimming down – the monarchy, Charles envisions a future in which fewer and fewer royals are allowed access to the Buckingham Palace balcony during events such as Trooping the Colour.