Why do some people say I look older than my age and some say the exact opposite?

It differs country to country. I will be 38 but i am never told by people overseas that i look my age but in India everyone's told me i look my age. Everyone has a different perspective and it depends a lot on where they are from

How we perceive others is often subjective.
We interpret what we see according to our internal mental filters.

Yes you are

You don't look a day over 36