It depends, I'm sure, on everyone's own body metabolism, activity level, diet, etc. That said, I have a very hard time losing weight despite eating healthy, exercising and being 35. And, it still only took me 4 months to get back to my regular weight. I gained about 38 or 40 pounds but I exercised right up until my due date (hey, I did Cathe's Terminator DVD - Gauntlet the day before my due date!). I also ate healthy and didn't use the pregnancy as excuse to pig out. I am breastfeeding too. I weighed myself today and I am actually less than my pre-pregnancy weight. So, if I can do it, I am positive any one can lose the weight!