Does temporal arteritis just affect in their 50's or can i afect young men too?

It certainly could: Disease does not follow the usual pattern in the majority of cases. Classical circumstances are found in textbooks not clinics.

Could affect in youn: It could affect younger individuals.

Rarely: It is possible, but extremely rare. One neurologist i used to work with said that unless there is overwhelming evidence, being under 50 virtually excludes it.