My children can never be donors, what do I tell them?

[Beaaware]

My children are 19, 22, 24, they were all born during the BSE crisis, the other day one of them asked me 'Mum I want to donate my blood when I travel overseas' , I know that this is not possible because all three of my children are banned from doing this in most other countries around the world.
AIBU not tell them exactly why this is, or should I let them find out for themselves, how do you tell your kids that they have potentially been exposed to deadly rogue prions?

I'm making a list of my favourite microbes ! see, learning can be fun !

Sorry,I am having a bit of a giggle over this. I think I have to let you in on something,because I think that maybe you havn't noticed...your children have,grown up !
I think they can handle it.
I was told that I couldn't donate because of the same reason,only yesterday infact (I moved to NZ from UK) and I slept ok last night

I didn't move yesterday, I was told yesterday...just to clarify!

I think the OP may have a little of the mad cow about her.