It depends. I've been coding for a living for 41 years and have a feeling I'll get the hang of it real soon now.
From the perspective of pulling some C++ programmer in 1993 into 2024, and dropping them into a large C++ code base consistently written with the latest C++ idioms.
(And yes, this is humorous exaggeration. But the name of C++ is apt. A C language dedicated to accumulating features.)
I just don't understand how someone could have been working in C++ and not picked up the largest changes even just by osmosis. My code-based "upgraded" to C++11 about a year ago, but I can still read C++17 and am not intimidated by C++20 fragments. YMMV I suppose.
C++ = Every time you look at old code, it is already out of date based on new features that were adopted after the code was written.