At age 74, I don't fire too many full-house loads any more.
I'm 75 (76 on January 9th), about 5'9" (shrunk down from 5'11" most of my life), about 135 lbs, and pretty much a "tottery" old codger. But I can comfortably shoot 240gr Underwoods in my 5" 629 for a whole range session, without beating up my body, or even bruising my hands. The secret is my VERY relaxed grip, and very relaxed and flexed elbows (used with a straight-on isosceles stance, with my feet equidistant from, and facing, the target). Basically, none of the recoil reaches the main part of my body ... it doesn't jar my eyes, neck, teeth, brain, or anything else. The recoil just gets absorbed purely by the inertia of my forearms. And my hands don't take a beating from the recoil because they aren't resisting the recoil. It doesn't sound like it could possibly work, but it does. And, perhaps surprisingly, I'm also more accurate using that method.
I arrived at the method by very gradually relaxing my grip, and starting with lighter calibers: first .38special+p, then .357mag, and finally with .44mag. I figured I could safely do it very gradually, and stop whenever I would begin to have a little trouble hanging on to the gun, or to start to touch my head with my forearms. And surprisingly, I never got to that point ... I never had to stop! And each time I moved to a more powerful caliber, and repeated the slow process, I STILL never had to stop the gradual relaxing process. At the end of the process, I ended up holding the gun (no matter what caliber it is, and with full-spec Underwood ammo) as if I'm holding a fragile little bird!
I'm as amazed as anyone that it works, but it does. It works so well that I'm not willing to shoot any other way. But I should add that the muzzle rise I get is VERY high, close to vertical (even though I've never gotten smacked in the face with the gun or with my forearms, or had the gun start to come out of my hands). But because of that near-vertical muzzle rise, I've been kicked off of two different indoor ranges, for violating the rule of keeping the muzzle pointed down range at all times. So my method won't be tolerable for everybody ... it may not be tolerable for anyone but me.
[addendum]: I should add that when I'm shooting, I'm never aware of that near-vertical muzzle rise, because the gun isn't left in the vertical position after the recoil ... it's an involuntary fast up-and-down motion, like in a "double-tap", except with a much greater angular change. When I'm shown a video of my shooting, I'm always surprised to see that near-vertical muzzle rise.
[addendum2]: I should also add that I put the X500 grips on my 629, and also on my 69 and my 686. That is probably also an important factor in making the recoil comfortable.