Electrician should be your first option. Pay is often better than other trades and it is more intellectually demanding and less physically demanding at the same time. There’s a shortage now too.

Most electricians easily work into their 60s so age should not be a factor. You will need to start off as an apprentice but given your demonstrated technical ability, I would hope you’ll be able to identify niche jobs within the profession that you will give you leg up for more rapid advancement.