It does happen & not just in the UK - a link to a motorcycling victim :
Induced coma for Covid
I know a number of people who have had it - family, friends & colleagues. Non have required hospital treatment and all have recovered. Seems to be that some likely to get it did - niece is a child care person & nephew's partner works in a pharmacy. Another who was being paranoidly careful to avoid passing it on to her 90 year old vulnerable mother ended up catching it from her mother ! A collegue caught it at "socially distanced" funeral.
Can't say that I could infer that being over 55 & catching it myself would lead to an automatic medically induced coma based on my actual, observed outcomes.
I look forward to having many more motorcycling adventures when released from involuntary imprisonment - and non will require an "adventure bike" !