I've been working out for about 32 years. I didn't make the big gains til the last 7 years. That's when I really started to concentrate on the squats. I use a 3 sets of 5 reps scheme and 5 sets of 3 reps scheme. Squatting twice per week. I can email you the squat routine I use. It is based on Artie Dreschler's squat cycle in his Weightlifting encyclopedia. BTW, I'm 45 and weigh 205#.