I was 5 or 6 when he read the Hobbit aloud to me. The trilogy is a bit denser so I read that jointly with him I think when I was 10. My daughter and I did all the books as bedtime stories when she was 8, and she liked them all, but the Hobbit is definitely her favorite.
A PPL split is a great choice, so no need to switch to full body unless you want to.
I also find doing full body takes too much time on a given day. My current approach is an upper-lower split instead. That way, on weeks when I can only hit the gym 4 days, all muscles are still getting stimulation twice in that week. When I can more consistently go 6 times per week I tend to do PPL.
The main comment I would have, which has also been mentioned by others, is you probably need to specify your goal (e.g. hypertrophy vs strength?). Then you can research the ideal rep ranges for that goal, as they can differ.
And most importantly, you need to plan for progression - you need some form of creating ‘progressive overload’ in your programme. If your sets and reps are always static at 3X15, then how will you do that? It may not be realistic to increase weight each time, but you could increase reps over time, up to a higher limit, and when you’ve reached that, you then increase the weight and start at a lower rep number - rinse and repeat. There are many other approaches to this too - so find what makes sense for you.