Arm Training is still relevant. Exercises to build bigger arms can indeed build better health for men over 40.
After I realized that chronic “functional” training was screwing up my hormones (cortisol too high, testosterone borderline low) I dialed things back. While the functional zealots will scream that arm training isn’t functional (a term almost never defined BTW), I call bullshit. You use your arms every day- doing real life things, like lifting very heavy tomato plants, controlling a mountain down a steep slope, carrying a whiny toddler who refuses to walk, or staying in the top position of a push-up for a long time .