If you're living sedentary and overweight/obese, I'd start with changing that to a more active lifestyle and maintaining a normal BMI. When I live more like a savage my sex drive tends to follow suit.
But I will admit that it's still much different in my 40s from say my late teens/early 20s. No amount of savagery in my mid-40s is going to make me the hornball that is my 19 year old self. That would probably require TRT.
By contrast, someone who is living a more sedentary life could possibly have more time and less stress, thus possibly be more focused on greater sexual frequency. Their abilities, socio-economic status, or access to women are other factors.
But you can get a chunk of that just hitting the gym. Personally I find actually being out in nature and getting dirty while doing strenuous shit makes a difference WRT my vitality and vigor. An air-conditioned gym is still a largely sterile, low-risk comfort trap.