I definitely noticed a drop in my metabolism right before turning 30 for me. Gaining weight without trying and if I do try I can put on a solid 5-7 a week with moderate effort.

I eat big anyways so capacity is no issue. I can put away a few pizzas in a sitting. But even at a normal amount of food for me, with a calculated bmr being met. I still slowly put on the pounds. Up until I was 27 I maintained my weight no problem. Even occasionally binging without gaining.

I haven't weighed in recently but I just measured my belly for the first time in a while and I'm now 72" around. That's 6 f***ing feet.

I'm 76" sitting, which is 6'4". So I'm 2 inches rounder when I'm sitting than my standing height of 74"