Yep and starts to diminish right around age 40 or so. I've been lucky and only my near vision has failed. I can see perfectly beyond about 3'.
My lever guns (30-30, 32 Spl, and .45-70) all wear Williams peep sights. I can shoot them as well as a scoped rifle out to 50 yards or so. And at 100 yards I am still plenty accurate for deer and bear. If I plan on shooting over 100 yards then my scoped Tikka 30-06 gets the nod with 180 Game King bullets. This has a Burris scope with ballistic plex that is accurate out to 500 yards and has made one shot kills at over 400.
But my favorite cartridge/rilfe has to be the .45-70 (Marlin Guide Gun). Everything I've shot at with that beast has dropped like it was hit with Thor's hammer.
One thing I want to express to you MD is that there is no such thing as a "brush" gun. I prefer to call them close range guns. Any bullet that hits an obstacle on the way to its target will be deflected. In fact there was a well written article years ago in Outdoor Life magazine I believe that showed that the .243 and 7mm mag were actually better at recovering stability after being deflected than a 30-30 or 35 Rem. But there was still significant deflection from these bullets.