Even better! Building materials were bigger then lol
PS - My place is 1920 old :) anyways a fun adventure doing work around here

Yes, but there aren't that many wires in your wall, and chances of hitting one are close to zero if you're trying to hit studs to hang a TV mount. Diagram

Figure you have 3/8" drywall on 2x4 studs... The electrician would have put any wires halfway back on the stud or further - so your lag screw would have to penetrate the wall 1 5/8" just to reach where a wire might be, and pierce layers of plastic and paper protective sheathing perfectly to cause a problem. And IF there was a problem, the breaker would trip before causing any real harm.

Hit the studs and you won't hit any electrical wires - it's really that simple.