John has a 2011 MacBook Pro that runs excellent. But he's concerned that he won't be able to update it soon. Leo says that if you can run macOS Mojave, you'll probably be OK for Catalina. One thing that could help is to put a new SSD hard drive: that'll help your Mac out. The only other thing you can do is update your battery if you can get one. Leo says there's no real reason to spend the money if you're happy with how it works, and you'll be getting security updates for at least 5 more years. So keep using it!