about 50.
To write "two and a half years old," you can express it as "2.5 years old" or "two-and-a-half years old." Both formats clearly convey the age in a concise manner. In informal contexts, you might also use "2 ½ years old."
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
-7
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.
69 years old
Two and a half years old.
There can be no proper answer as the father will not live to be 150 years old.
10 and half years old
The rock is 2 half-lives old. 18 million years divided by 9 million years (half-life of RI) equals 2.
49 years
50 years old
one and a half years old.
87 million years old
30 years old