Other than in some very niche and select circumstances that I honestly can’t really think of, nobody is going to think it’s cool. However if you like it and want to do it then that’s really more important than if others will think it’s cool. However, I should add some caveats to that.

In some environments, if you’re young than school especially, can be very cruel and very conformist. In those sorts of environments, being “weird” can seriously make you miserable because you’ll be ostracised and while being authentic and true to yourself is important you’ll need to decide how important this specifically is to you, because if it’s not that important then in a context like school I’d say don’t risk it.

However if you want to try it out sometimes around friends who already like you then why not? Just try to keep an eye on people’s reactions and see if they start to get tired of it or roll their eyes or visibly cringe, that’s a sign you’re doing it too much and it’s getting irritating. Definitely don’t change your entire speech pattern to whatever you decide equates to “old timey”, all the time in every conversation with everyone, it won’t land well.