Square D is an excellent brand and hold up well but tandems have a greater chance of breaking down. I’ve never liked those. 50 year old tandems could well be at end of life.
BTW: Changing a breaker is actually not that hard. You do have to turn off the main breaker to do it though, killing the power for the entire house.
How many circuits are blowing and how regularly. Do you have anything with a potential high draw on those circuits. An older toaster oven, a fridge, a window AC unit, something like that?
If they’re lighting circuits and you still have incandescent bulbs, just switching to LED bulbs can wipe out a large portion of the load.
But from what I see in your OP, I suspect you have breakers breaking down.