Old electrical installation - can the age be determined?

Hello and thank you very much for the answers,

but for me it means: Without an electrician no real statement. :)
Does it help if I say that all lamps (except maybe the storage) are operated with 3 wires?

Best regards
Rüdiger

No, that doesn't help either. What is your goal? Even old installations run perfectly.

Hi Hampshire,

Well, I am an amateur in this field. We want to take over the house from my mother and renovate it, then move in ourselves.
Everything works perfectly and there have never been any problems with the electricity. The stove is specially protected "as it should be," done by an electrician.
I just don’t know if I should now basically do the entire electrical system anew "prophylactically" or just let it run as it is.

Regards
Rüdiger

It was not about "definitive" statements. An assessment based on the picture was required, whether it is okay or needs to be redone. There is clearly more in favor of "is okay" than "needs to be redone."

Based on the picture, one can only tell that maybe a fuse was replaced or FIs were installed. The wiring in the walls, however, could already be 100 years old. One thing in Diez is the colors of the cables and their number. Based on the colors, assessments can already be made. You can also ask Aunt Google about it.

One in Diez are the colors of the cables and their number.

Or also one in Limburg, which is right next door (but still in a different federal state). Always these spelling "corrections" ;-)