Well when I was in my 20s I was eating +5000cal a day no trouble, it was even insane how I could eat sometime.

But now in the 40s, it's not the same. Now I eat 300g of protein per day, about 100g of fat, so I have not a lot of space left for carbs 150-200g top, and I gain about 1-2lbs per month with that.

If I wanted to eat more carbs, I would either have to cut into the proteins or into the fats, which is a MUCH less healthier option for me. 150-200g of carbs per day is plenty enough for me to train hard and gain.

20s, 30s, 40s is not the same, the game change as you get older.

Eric