A 9 year old has more seperate bones as some bones fuse together later in life.
Someone was 49 years old in any year of your choice.
Yes, at 20 she/he is an adult and she/he can date a person who is 49.
49 year old ...
49 because each year the dog turns 7 more years older and 7x7=49
Yes, they can even have sex!
49 years old
48 or 49
49 this year (2012)
68
A Tricenarian.
It is legal, so it is not wrong.
A 7 year old boy should be about "49 to "55