You cannot spot reduce! Weight loss results from an energy deficit; burning more calories than you take in. Aerobic exercise will help create this energy deficit. Genetics and gender play a role in where we store excess fat and where it comes off first. Abdominal exercises will tighten and tone the abdominals but will not directly affect the layer of abdominal adipose.
I have helped numerous clients succeed in significant weight loss journeys that involve losses of over 20-30 kg in body fat over the space of 1-2 years or more. I actually find such longer term journeys more rewarding as they allow me to teach my clients about the impact of nutrition and lifestyle habits on their physiology. This not only helps them, but also helps those closest to them as well.