Loss of joy for life after 30 normal?

Hey guys,

I am a lil bit over 30 now and looking back I have lost a lot of my vibrant energy, joy of life and positivity in general.

Back in the days I was able to be happy about small lil things and I was so full of energy everyday, and I felt like I am going to take over the world (talking about my 20s here). I had so much more humor and fun in general as well even though there were a bit of challenges in life.

Now, I have reached 30, have a stable quite well paying job, no need to really stress about my finances (even though it could be a better as well) but the old me is just gone.

Back in the days when achieving a goal, the whole experience was something else. The "looking forward to it" and then achieving it would make me shine.

Now it's gone. Work is just work, I have no real drive or desire to push harder.

EVEN THOUGH I achieve things much more easily (and a lot more at the same time) than in my 20s (work, relationships, dating) but it doesn't really do it for me anymore.

Do I suffer from low testosterone? Is it just being over 30 and normal? Do others feel the same? It is really strange, it is like my 20s-me was a complete differnet person.