As you age and your body changes, things you were never bothered by in your youth, which you were never aware of. Can suddenly become life threatening or at the least a gigantic bother.
Until last year after 57 years I was never bothered by water cress. About 2% of Caucasians have severe dermatological reactions to touching it. Eating it will swell up the throat. From the waist down I had a reaction like poison Ivy without the blisters. Fortunately I was part of the small percentage that 2000mg of vitamin C stopped all of the reactions in 15 minutes.
Wonder if you gents will have bad reactions to black fly's and all the relatives of the Horse and Deer fly. At least you don't have the Texas tick in the UK which can cause a severe allergy to red meat.