I'm 41 and thinking about getting into the trades. Is it too late for me?

I live in Texas. I'm 41 and have no experience in the trades, although I do have industrial experience from my time working as a mudlogger on oil rigs. I'd like to find a trade that's not the kind of physically demanding that will mercilessly destroy my body over time, although I'm not afraid of working hard in general. I'm worried about age discrimination in starting in the trades. Any recommendations on what kind of trades I should look into?