My mother always has siamese cats. One was a siamese tabby though. Anyways... They ALWAYS are biters. Or at least the three we've had in my lifetime. One named Tiger bit me when I was little and I learned my lesson to never touch that paticular cat again. I was pry about 3 when it happened and I can still see it clearly in my head. Never ever made the mistake again of over petting my welcome.
Did this scar me. NO! It taught me to respect animals. I have three cats to this day. As a young girl I had two very special cats to me that I still mourn to this day.
Some cats are biters. If they don't inflect damage (as in require stitches or even just the presense of blood I guess)or go after you (as in stalk with the intention of attacking) I personally say you educate the youngsters that if you mess with that cat you may get bit. It doesn't mean anything... the cat is just grumpy. But you know this so if you get bit you well Get bit! LOL!
You've had this cat for 14 years. You know her! She is now just old and in more pain every year just like as what happens when we get older. She'll have less patience but she means no harm. She's just like a grumpy old lady or man! LOL!