I didn’t find any Bitcoin on an old computer, what now?

Everyone says they found a bitcoin on a 20 year old hard drive or computer but I’m here like I didn’t have a hard drive or a computer 20 years ago to now be able to find anything on it.

I’m looking for step by step instructions on how to find an old computer with bitcoin on it and also what i should tell people in my DMs and email spam folder who are reaching out with bitcoin offers for me?