Super slow is not static. It's about 8-10 seconds per rep.

Yes, it makes you look better and get stronger and healthier. It wouldn't work for a competitive lifter I suppose since that takes a lot of practice managing those weights, even if someone is strong technically.

Idk what regular person, especially approaching retirement age really cares about putting up big numbers. they exist sure like everything else, but I'm giving general advice not body builder or competitive weightlifter advice.