Hey Jess,
honestly, you look androgynous already. I would have a moment of uncertainty gendering you from just the face. As you continue HRT and try to build confidence, I'm sure you'll pass better and better in terms of how you look. Remember that passing goes beyond the immediate visuals--it also involves how you talk, walk, act, etc.
And 22 is definitely not too old, as the others have said. There's no 'too old.' I started when I was 27. Many others here have started much later than that, and they look amazing. It's only too late if you let yourself believe that lie.