I'm only on donation 4 now, but that was because of your initial post Glen
I'd been meaning to do it for years but kept making excuses up.
I've since found out I'm special (my Mum always told me that!) as I'm O- but have minimal antibodies etc. on my blood so I'm exclusively used in Neonatal Intensive Care (I've got the NEO-rr marker on the back of my form). I'm now going to keep giving as long as I can.