How old was Hinata when she had her children? How old were Naruto and Hinata when they had Bolt and later Himawari?

I have just been puzzled by the question and couldn't come to an answer.
Chapter 700 of the manga takes place 15 years after the 4th SWW. During the 4th SWW, Naruto is 17 and Hinata is 16. 

So at present, they're 32 and 31 respectively. 

Boruto's age is revealed to be 12. There's a confirmed two year age difference between Himawari and Boruto. Therefore Hima is 10 years old.

Since Hinata is 31 years old currently. Therefore, she was 19 when she had Boruto and 21 when she had Himawari.