If you cut out a cost, a Latte that is about 500 calories a glass of wine is around 250 calories. The key is reducing your calories and increase your crunches.
Ball crunch to work on a flat stomach
The next question: Can I build muscle at my age
Yes, you can tighten and tone. As we get older we reduce the hormone to gain muscle but you can defiantly improve your muscle.
I try and keep the muscle working at different angles to keep the muscle fired up. Here are a couple ways to keep your chest firm and fit. Incline Chest Press and Incline Chest Fly.