Is that all you can do in a day? Man, you are a wimp. Just kidding. Seriously, You need to realize something. Your body needs rest, because not only does your body need to recover, but it is at rest that your body builds muscles. When you exercise, you break down your muscles, then rest time allows your body to build back your muscles even stronger.
So,what I see is that the running may decrease your muscle size a bit because you may be overtaxing your body and running tends to promote leaner smaller muscles and not the "BIG" muscles, so for you, it may be okay. PS remember, it is also going to be harder for you to run if you already wore out your muscles with weights, Or harder to lift weights if you run first. Of course, you can get away with more when you are young, but once you hit 80, need to cut back a bit.