23 y/o male, what are these lines around my eyes and how do I flatten them? photos)

23y/o male. These lines started appearing when I turned 18 and have been getting worse. They were very faint at first but have been becoming worse. I feel like it might be a lot of volume loss under my eyes and around my nose. But im confused why this happens at my age. I did gain weight these last years, so I'm wondering if maybe this could have caused this (more volume in the midface, which makes it around seem hollow). Im losing weight first now. What could this be and how to treat it?