Other than the OS .46 being a tad small for the tiger .60, sure use the old stuff. I have a buch of active stuff that is around 18yrs old (eegads, I shouldn't do the math on that one, suddenly I feel old). Transmitters and receivers from too long ago (pre '91 timeframe) may or may not be useable, and replacing batteries isn't a bad idea as others have said. But engines, servos and such are fine. (my oldest operational parts are servos, as it happens. I still have the first 4 servos I ever owned, and they are still flying plus or minus a gearset or mounting lug here or there).

And my JR x-347 TX from around '91 is still going strong and still as the same batteries in it. (shhh). The TX has a nice voltage monitor on screen, so I'm comfortable using old cells in there, but I'm using all new RX packs. And right now, I'm in the process of refirbing an old Cap 21 kit from around '90 that's been gathering dust in the basement. The OS .61FS is a bit gummy, but no signs of rust, and I didn't even do much to it prior to storage.

Oh, old gear at the field is also good for some other types of fun as well. I was using my x-347 as a buddy box on one of my student's Alpha (we have a shortage of JR buddy boxes). While were flying, I asked how old he was. He's 11. So I say "hmm, that transmitter you're holding is older than you are". And he says "really, it was desgined before I was born?" and I said "yes, but I meant that I bought that particular transmitter before you were born". His father got a good laugh out of that one.