Ah, the joys of getting older, it seems like half the stuff I have had to do on my TR250 the last few years has been under the dash. Had a Porsche 924 a couple years ago, even more wires and fun under the dash.
I can still move and get to most of the parts I always could,but it is not as easy and I hurt more afterwards. But wait-there's more...
My strength-bolts used to faint and give up at the sight of me, now I have to take a hammer or breaker bar to get those hard bolts started.
My eyes-near to mid range vision harder to focus even with glasses, and the need for light where once I could easily see, thank goodness for cheap LED trouble lights.
Memory what order did I take this apart in? Did I tighten Where did I put that gd half inch wrench? (this one has always been an issue, overcome with sheer brute force, I have at least two sets of everything)
That being said, I am probably as good a mechanic as I have ever been, have tools, techniques, lights and tricks to compensate and hope to be enjoying working on cars for many years to come, including a few after I retire in 5 years or so.