You’re never too old to fly but here are the health risks to consider

The need to stay hydrated

“This really is one of the most crucial bits of flying advice at any age, as the cabin air is very drying,” says Dr Patel. “I would advise steering clear of caffeinated drinks such as tea and coffee and certainly alcohol (yes, even if it’s included for free) as these would only dehydrate you further. The gold standard advice is to drink water only. Don’t wait until you’re thirsty, just keep drinking it. If it means more trips to the loo you’ll be moving more too.”

Be aware of taking any medications

“If you take medications such as pills for high blood pressure or any other existing pre-conditions, and will be crossing time zones, discuss with your GP whether you should take your medicines at your usual time at home or switch to the local time zone,” says Dr Patel. 

The cheap pill boxes sold in chemists, which are divided and labelled into the days of the week, can be useful for keeping track of meds. Half the pleasure of travelling is surely trying new foods, but it’s wise to check that nothing you’re likely to eat will interact with your medications or health conditions.

High altitude when you have a heart or lung condition

The changes in cabin air pressure, decreased oxygen levels and limited access to medical care can make travelling with pre-existing lung conditions more risky. 

People with chronic obstructive pulmonary disease may experience difficulty breathing at high altitudes. While the dry and recirculated cabin air can exacerbate respiratory symptoms. Air travel can trigger asthma and exposure to allergens or irritants in the aircraft can worsen asthma symptoms.

“It’s essential for anyone with a lung condition to consult with their healthcare provider before flying and receive personalised recommendations,” says Dr Patel. “In some cases, supplemental oxygen or adjustments to medication regimens can make flying more comfortable.

Flying with existing conditions (including cancer and dementia)

“Cancer is a process but not a single disease, so when it comes to flying there is no single rule,” says Dr Patel. “Fitness to fly would very much depend on the individual, although that said, DVT risk is higher if someone has cancer, so considering preventative measures is important.”

Air travel is not generally advised for the month after any surgery. With regards to dementia sufferers, says Dr Patel, it would be extremely prudent to travel with someone they are close to. “Unfamiliar environments can be very distressing. Airlines may also have a policy in place for this so it is worth checking with them before booking.”

“Even for mild dementia, it would be sensible to inform the crew on board so that they are aware and to have a letter from your doctor to support this.”

What are the benefits of flying when you’re older?

Travelling expands the mind and enriches your life whatever your age. The Telegraph’s hotel expert Fiona Duncan, 70, says: “One good thing about ageing is that I am no longer a nervous flyer,” she says. “I’m much more relaxed. I know I’ve had a good life.”

Duncan’s most recent long-haul flight was to India last October. She says her fragile sleep pattern was disrupted for days after arriving there, and weeks after returning home. But “mild sleeping pills helped me break the cycle of waking at odd hours”. 

“In all the many years I have flown long-haul, I never ever ceased to wonder at the miracle of being in Heathrow Airport one minute and then somewhere incredible and thrilling just a few hours later,” says Duncan. “It has been the great privilege of my life.”

Meanwhile seasoned traveller Hilary Bradt –  who hitchhiked in Germany last year – says: “I wish we weren’t so hung up on safety rather than enjoyment these days. My only advice – to the King and anyone else in their 70s, 80s and beyond – is just do it.”