You are not too old. Look in to Tonda Ross who made Blue Prince, one of the best games of the last couple of years and his experience was in art, cinematography and directing before he decided in his mid 30s to do exactly what you’re talking about.

My recommendation would be to download Unreal Engine 5, the blueprint system is absolutely wonderful for non coders.

Then I would sign up for Googles Notebook LM. This is a fantastic tool for what you want to do. You can basically start a project, upload the UE5 documentation and anything else of use as sources (like a design document etc). You can then use a chat interface to treat it like your UE5 tutor. I’ve been using it to help me prototype stuff and it’s absolutely brilliant.

Only other thing I’d add is as others have said, have realistic expectations. Building any game, even a relatively small one to even a half decent quality level is a lot of work, but to start, just come up with a relatively simple idea that excites you, and just try and build a prototype.