Being the oldest beginner in the class takes more courage than being the youngest expert.

Starting late means being visibly bad in front of people who expect you to know better, and that exposure is the real barrier rather than the difficulty of the skill. Competence elsewhere makes it worse, because you have further to fall in your own estimation. Most people avoid it entirely, which is why the room is mostly young.

Go anyway, and tell whoever is teaching that you are starting from nothing. It removes the pretending, which is the tiring part. Give it three months before judging, and notice that nobody there is thinking about you nearly as much as you assume.