Croup in older children

[UK Mom]

My 9 year old is just recovering from a bad bout of croup, which my 5 year old has just picked up and is suffering from at the minute.  My 9 yo has always been prone to croup (as I was, even hospitalized with it as a baby), but I thought he would have grown out of it by now.  But this time seems to have been just as bad as ever.  (Not needing hospitalization but a few bad barky cough for several days and nights, plus fever.  He has had it for a week and is still exhausted from it)

Does anyone else have experience of an older child still getting group?  At what age did they grow out of it?

[redhats]

i have 7 chlidren 6 all ways get croup the ages are 12,10,9,7,6.2.my 7 year old has just came out of hosptl with croup i was told he is to old to have to have it.but when i told them that 4 of my kids are down with  this he was puzzled to knw my 12 year old still gets croup. he is going to send a letter to my gp to check if my chlidren have very small airways