I'm a middle-aged woman. I don't want to get fat but I do want to get stronger. What I do is eat a lot of lean meat and potatoes and not much fat (except for chocolate which I can't seem to stay away from.) I've been lifting since October. The longer I keep at it, the heavier the weights get and the more lean meat I need to eat. So far only portions of my body have gotten bigger like my thighs and biceps (I can flex them and see them now), not my belly or any of the other signs of me getting actually FAT. I suppose if I wasn't a middle-aged woman I might have actually "bulked" without getting fat.
Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.