I'm mid-40s so it is very hard paliitin ang tyan.
I do crunches (upper and mid abs) and leg raises (lower abs) 20 reps each day for both x 2 sets. Tapos diet, like half rice lang per meal tapos healthy food (salad, chicken breast, seafood, egg whites, oat cereals) and snacks (e.g., fruit, tuna can).
Then I run or walk 10 minutes at least a day.
Here's my pic a few days ago. It's basically the same body since college, maintain ko lang. Pero tuwing June to Aug, yan ang stretch na dinadagdaan ko ng konting buhat sa gym para lumaki ng konti yung dibdib saka biceps para mas lalo magmukhang maliit tyan.
Ayus yan Bro.
BTW, nagtatrack ka din ba ng Calorie intake mo?