I was 70 when I started to learn Bass at the beginning of 2021.
Here’s some advice for you - When you get to the lesson for Billie Jean just follow the lesson and if you cannot keep up with the slow track don’t let it get you down. Just move on and come back to it later. Most cannot do the slow workout at first.
The idea is to learn and have fun.
What Bass and amp are you using?
Oh yeah, welcome to the forum and all the best on your Bass journey and don’t forget to go over to the Introduce Yourself! topic if you have not done so already 