I've searched the forums, and the variations of this question are not often specific enough to get a solid answer, so here's my situation and question;

If I have an older MacBook that I no longer use but that works great, and I have it reset to factory specs, then install a wallet on it, and use that computer as a "cold" wallet, with all wifi and wireless settings turned off, and only physically plug the laptop in when going online (20 minutes here and there) and unplugging it... could that be considered safe enough to be a secure place to store BTC or other crypto?

A MacBook and it's settings is something I'm familiar with, have an extra, and like being able to put different kinds of wallets on it.

I'm not talking about connecting to wifi now and then, I'm talking about ONLY plugging in the ethernet cable when going into the wallet and unplugging it when I'm finished.   If I have the spare laptop (can't sell it, it has sentimental value but I have a newer, faster one I use daily) would the experienced on here say that's a secure way to store coins?