I'm confused

Rating: 5/10 (12 June 2020)

So based on the cell phones the movie takes place in the present day almost 50 years after the war. The men are in their 70's even in the flashbacks?? Old guy visits old Vietnamese girl friend who looks in her 40's at most. Then a daughter comes in who is supposed to be their daughter which would make her 40 something but she's obviously maybe 20?? Couldn't get past this