Is it okay to use a refurbished laptop to make a cold wallet as long as I remove the wireless card? Can an encrypted wallet with over 30 characters(random, numbers, LC letters, Capital letters, and special characters) still easily be hacked without using a keylogger to obtain the password?
That's a decent high entropy password. The problem is will you remember the password in 10 years? If you get injured could somebody who you want to give the wallet to be able to open it.
Using 8 random words that you memorize and alternating use of spacebar would be easier.
Of course having a paper wallet is a safety workaround.