I have done both, in different periods of my life. Neither is “better” by definition. It is a matter of what fits your lifestyle and preferences right now.
What the Gym Gave Me
At the gym, you have access to heavier weights and professional equipment that grow seamlessly with your progress, without you having to invest in a home gym yourself.
But just as important is the social factor: a fixed structure, familiar faces, and just that bit of extra push on days when motivation is nowhere to be found. I develop that social side further in Relationships & Connection.
What Training at Home Gave Me
Training at home offers real freedom: no travel time, no waiting for occupied machines, and a very low threshold to get started.
With a pair of adjustable dumbbells and your own body weight, you can already get a long way. The five basic exercises from my program (squat, chest press, row, shoulder press, and plank) are easy to do at home.
Where I Ended Up
In the end I chose the hybrid form: the gym for the heavier strength training and the social dynamic, and home for the busy days when a lower threshold made the difference between training and not training.
All that matters for your health and for building muscle is that you get moving three times a week. Where and how that happens is entirely up to you.
The full exercise instructions are in The Power of 50+
This is my experience, not medical advice. If you are unsure about technique or load, talk to a doctor or physical therapist.