My oldest reloading components are from the early 80's. Quite a few full and partial boxes of rifle bullets in the attic I need to get down, some day. Not much call for for the Sierra match bullets around here (100 yds. is it at the range and nothing over 200 yds. if I was still hunting). If I was to start varmint hunting again I'd get all those 45, 52 and 55 grain soft points/hollow points for the .223 down and start using them.
I used up all the primers from the early 80's about 7 or 8 years ago and most of the powder. Only have the IMR4350, W760 and a tiny bit of W748, some IMR3031, 4320 and 4064 (all the .308/M1A trial/test stuff that either didn't produce the accuracy I wanted or was damaging to the gas system.)
I do have a couple boxes of WW2 era steel cased .45 acp ammo. That's the oldest ammo I've got. The HXP .30-06 is a combination of late 60s and early 70's boxes/cans/crates. All good stuff. Ran across a bunch the other day I didn't even remember having. Christmas presents for the sons and nephew this year, to go with the M1 Garands I gave them last year. I am telling them to be sure to bring me the brass, to reload.
I still say, while being more costly in the long run, that being disorganized quite often results in very pleasant surprises for me.