Phoenix,

  I don't know if you read my trip report about the Yeh to Lonely portage, part of my 21-day solo in 2015?

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May 29th.

  I said that it was the hardest portage of the ones I've been on. I was 65 then and doing it solo, with a bum right foot.

  I had to 3x it. My trip report tells the story. That portage has it all, none of it good.

  However, 2 guys, even your age unless you have bad physical issues could do it IF you plan/work smart.
I would break it into sections as the portage itself is.
Take ALL your gear to a point you get tired and take a break, keep doing that until you get to Yeh.

That steep rock face I carried the canoe-up barely, I wouldn't do that way again. I'd drag it up and with two guys that would be easy.

  The bog part was only bad because the corduroy was shot. IF they fixed that, then no big deal.

Plan for ticks/mosquitos like Jimbo advised AND bring plenty of water! In a pinch you can filter water from that small stream you cross just before you hit that steep rock.

Barring physical issues, I'd go for it. You make it thru that portage in decent shape, it will do wonders for your self-confidence!  ;) ;D ;D