That will be impossible to judge up front. I had a look at Rawk's most telling picture, and see no caps bulging out, which is a good sign.
Now, electrolytic caps all loose some of their capacitance over the years due to the electrolyte gradually drying out; how fast this takes place is in part stated by the manufacturer and in part depends on their use and how lucky we were with the production..
The reason I always say replace them is that electronics as old as our ADA's will have a number of e-caps in less than optimum shape.
Not only can this create hum, but i.e. a cathode resistor with a bypass cap that's down in value will result in different transfer characteristics / different frequency response than was intended by ADA when they designed it.
As such,, I see no reason not to replace all e-caps when about to do the basic sanity scoop-up's anyways..
You know, it's commonly said that our ADA's all sound a Bit different, and I think components going off factory specs could well play a role here.