I am 50. A while back I had a nerve twitching in my face. It was quite strong and affected the right side of my face and especially my lip. It was quite visible as it made my bottom lip stick right out. It lasted for about a month/6 weeks and then stopped. A week or so later I started to get twitches/tremors in my right thumb when my arm was down by my side and completely at rest. A few months later, it is still doing it. It happens a few times a week but not for very long. Then when I am using my computer at a desk and my arms are up, it does it then as well. It eased off and has now started up again.
I am not sure if I am being a bit paranoid. I am a doctor avoider usually. Would you go and ask about it?