In reply to Del:
Im coming back after a 5 year break, I've never been a brilliant climber but at 53 I feel like giving some proper focus and attention before I get too old for improvement is a big motivation.
I have started bouldering (never did much before) as a way of getting stronger and I try to notice tiny improvements as a way of staying motivated. I find it easier to notice progression with bouldering - trying harder grades until they are doable and getting stronger in the process.
I'm trying to train rather than just climb as it gives measurable improvements - increased reps, weight's, times etc.
I'm doing thing I always thought were only for harder climbers - fingerboards, campus boards (feet on!) and circuit boards. The circuit board is a revelation - I started off not bring able to do 2 or three moves on the easy problems but quickly got so that I could link moves then complete the problem. Then I started trying harder stuff.
Get some training ideas - YouTube is great and there's loads of stuff online. It doesn't have to be fancy, just more focused than 'just climbing'. I find having an intention when I get to the wall inspiring, seeing progress as a result is also inspiring.
I've identified the areas of weakness in my climbing and intentionally work at them including technique workshops at the wall. One of the advantages of being older is having a disposable income to chuck money at a problem - pay for coaching, get lattice training gubbins, whatever inspires you and helps !
I should also say that I do go to the wall or outside to 'just climb' and have fun with friends as well. It's also a good way of testing my training, seeing if it translates to feeling stronger, moving better etc on real rock.