about 50.
There can be no proper answer as the father will not live to be 150 years old.
49 years
a century is 100 years so half of that is 50 years
59
About fifty seven and a half years old
-7
69 years old
when Nina will be 18 years old, her mother will be of 36 years. so at the of Nina's 18 years, she will be half old as her mother.
Two and a half years old.
10 and half years old
There can be no proper answer as the father will not live to be 150 years old.
49 years
The rock is 2 half-lives old. 18 million years divided by 9 million years (half-life of RI) equals 2.
50 years old
87 million years old
one and a half years old.
30 years old