Like fast eddie, I'm also a geezer but with more experience - handloading since 1949. Some geezers develop alzheimers or other forms of dementia to the point of total forgetfulness. I think all older people experience slow reaction times, eyes that can't quickly handle headlights at night and return to total darkness, etc. Eddie mentioned distractions and that rings a bell for me. I am more easily distracted now and I will only handload in an atmosphere free of distractions. If there is a distraction, I leave the reloading bench until things settle down. I allow only the powder, bullets, brass and primers for the cartridge I am loading to be on the bench top. I use dummy rounds to set the seating die. I recheck powder weights. You know what convinced me I needed to be more organized? Couple of years ago, I was distracted while in the process of changing from one cartridge to another. I tried to clear the decks for the new cartridge before attending to the distraction. Forgot to change the powder in the trickler from H4350 to H4831. Max hunting loads and I dump a light powder load onto the scale and trickle to finish off. Fortunately, I discovered the problem after charging only three cases. Geezers can and should adjust to their deficits. The problem comes when they can no longer recognize the need to make changes. That's when family has to step in.