Second to KL in size are the historic trading cities of Melaka and Penang, with buildings dating back hundreds of years.
If I wan to say the age of buildings in Melaka and Penang,
1.Buildings in Melaka and Penang are hundreds of years old.
2.Buildings in Melaka and Penang are hundred years old.
I want to know whether "hundreds of years" and "hundred years" are the same in meaning.