Is it normal for it to be harder to lose weight as you get older, even if you exercise?

I'm on a diet.

I'm not the type to habitually diet 365 days a year.

Do dietary control only when you need to lose weight.

I usually do about two hours of cardio exercise.

 

In the past, if you did it like this

Maintain your weight without controlling your diet, or

I actually ended up losing weight during a tiring week.

Lately, I can't lose weight, or sometimes I even gain it.

 

It feels like it's been swollen for a month.

I'm also controlling my diet.

Don't even talk about when you have to feed your family

I am having a salad for my meal.

If you combine 2 hours of aerobic exercise and daily walking,

I'm walking between 20,000 and 25,000 steps.

But there is no change in my weight.

 

Does it become harder to lose weight as you get older, even if you exercise the same way?

I'm even controlling my diet, but there's no change in my weight.

I feel so drained.