Advice on central ac unit

If I have an AC from the mid-90s, and I think it's R22, is it even worth it to replace it? It works great and has no leaks as far as I know. The electric bill isn't bad at all either, and it easily cooled my house to 70°-72° during a 90°-95° heatwave. But I was told that it probably should be replaced soon. To be fair, it wasn't a licensed HVAC guy who told me that. I'll edit this post or put it in the comments to let you know if it's R22 for sure or not. I'll check when I get home. I inherited this house and moved in recently so I don't know for sure lol.