You are in obvious need of a jump start here. 6 mos. with no noticeable change, when that is what you are looking for is a sure sign. Times a week means nothing. What you do with that time means everything.
I'd like to see you go to 3, no more than 4, lifting days a week. Change up your rep/set scheme. You did not list any, but my guess is you are doing maybe 3 sets of 10 or maybe a pyramid type workout. Change that up. Do maybe 6-8 sets of 4-6 reps of "big" lifts. Stick with multi-joint ex. and throw in some add-ons at the end of your workout depending on what scheme you choose.
Total body 3 times a week, or switch upper and lower body for 4 workouts a week. If you go with 4 workouts change the parameters each time you do an upper or lower. First lower 6 sets of 4--second workout 4 sets of 8-10.
Take a look at your diet. You eat 6 times a day, but what is the basic nutrient breakdown. Focus on getting enough protein throughout the day. Plenty of complex carbs early in the day. And make sure to get plenty of good fats a day. Especially at our age, I feel Omega-3's are VITAL. If you buy them at a store you should probably take 2-3 pills 2-3 times a day--minimum. Flax and olive oil are also very beneficial.
Your present workout is somewhat old fashioned so read some of the articles here. That doesn't mean it can't work, but it isn't for you right now so especially focus on changing this part of your program. Good luck