Hard to tell for sure with those pictures, although apart from some significant recession at the temples your hair looks thick. Hair loss isn't the same for everyone - some guys recede at the temples but then their hair stays the same for years, on the flip side with regards to medication they always say the earlier you start the more effective it is.
Personally I wouldn't advise going on medication unless you are 100% sure, especially at your age. My advice is to keep an eye on it, take pictures every few months to compare and see how aggressive the loss is (but try not to obsess about it too much). If you really want to go on medication do some research so you know the potential sides. Good luck!