Quote from: NeuroticFish on Today at 10:21:31 AM

If you generate a BIP39 seed, that should work also in 20 years. If you save a private key, that should also work in 20 years.

See my [overview] Recover Bitcoin from any old storage format:

Quote from: LoyceV on August 26, 2018, 01:09:32 PM

I've seen many threads like: Recovering weird old wallet, and the answer is often very easy if someone recognizes the format.
Since the number of different formats will only grow, and (in the future) I expect more people to forget what format they used to store their Bitcoin 10 or more years ago, I've decided to create an overview.

Just in case: write down which wallet you used, including the version number. In 20 years a lot can change.