I am two years older than him
Wǒ bǐ tā dà liǎng suì
I Than Ham Big Two Years of age
When talk about the age of any person, the word 岁 (suì) is always used (not 年 nián). This goes also in this case where you're not talking about a persons age in definite terms, but you're talking about it in relation to another person's age.