Nina, not sure how big you are, but it's worth it to go up on the protein. I'm 47 years old, pretty darn short and already fairly muscular. I assumed my lean body mass to be about 100lbs so that would be 100g of protein which works out to about a 14oz steak worth of meat each day. I tracked myself for a few weeks and realized I was eating about 60-80g per day on average, which although it blew away what myfitnesspal said was my goal, apparently was not enough. I started adding more and I started feeling much better, more full after meals and generally just healthier. With some fairly mild workouts (core fitness with body weight and 5lb dumbbells at the most) I'm building some pretty impressive muscles on myself. And strength, too. Not bulky, but the wap-wap is being replaced with stuff I can flex. It's pretty nice. I'm not losing any weight or size, but things are improving anyway. I think I stand taller and feel more confident.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Current squat: 180 x 2. Current Deadlift: 230 x 2