Help first time traveler

Hello im flying internationally for the first time with a senior (75yo) my final destination is París CDG with a connecting flight in Munich (1h40m) and On my way back a connecting flight in Frankfurt (1h20m). Im very anxious. Will that be sufficient to make it considering im traveling with a senior? Do lufthansa provide priority to seniors? Will it be chaos?? 😭😭😭😭 english is not my first language but i think i can manage. Help please, im grateful for any tips you have