You can always stock up on a nice, lean some of these...which have more protein than even the best protein shake.
One reason I stopped taking protein shakes all together. I remain far more cut without them...
I used to take them a lot until a guy told me, "you don't need all that". Unless you're playing in the NFL or sports and really busting your ass, else you just getting too much.
Sure enough...I lost 10 pounds of 'dough'. But then I gained back 5 lbs later on. So 180, 170, 175...Sometimes if I've fell off the gym for awhile or been having periods where I haven't eaten properly then I'll get a protein shake for a month or so and then stop, just to speed up my weight.
And especially since you're an older guy...your metabolism is slowing and you won't be able to process that as quickly as a younger guy would. You're just going to end up fat.