Recently I was visiting one of my friends who writes code, he brought up this topic to me recently saying that it seems like old wallets are being hacked into, that hackers have targeted older BTC addresses because of their vulnerabilities and lack of security.
Could it be that folks have figured out how to crack the codes on these old private keys? IF so, they are seeing some massive pay days, EH?
It is impossible to break private key and steal it.
It is possible for someone to get access to a very old disk then successfully access an unencrypted wallet file or break a wallet file with encryption. It is a more realistic case if you are discussing about wallet hack.
However, above all, there are many possible scenarios why coins from old eras are moved in this year. They can move their coins from old wallets to new wallets. From a single signature wallet to a multi signature wallet, cold wallet, and something else.
Such transactions does not always mean old wallets were hacked.