Analog tape to digital is not too hard, if you have a computer with audio in (virtually every computer made in the last 10 years does), and a tape deck with audio out. For media longevity, high quality digital tape, properly stored, can reliably be expected to last ~30 years without maintenance. Typical consumer-grade recordable CD/DVD media, not so much; 10 years at the outside, in near ideal conditions. Archival-grade recordable CD/DVD media should last longer, but I do not know if 43 years is within the design spec even on that. A "pressed" CD should outlast any recordable media easily, as would an analog record. Analog audio tape will almost certainly still be playable in 50 years, though the quality will likely have degraded noticably--I have some reel-to-reel tape that is nearly that old, stored in less-than-optimal conditions, and is still playable.