Is it normal to only cum a few drops at 20?

During my teenage years, up to 18, I could cum once a day and the amount was normal. Of course, if I waited longer without ejaculating, it would come out even more, but ejaculating daily was fine.

From 18 to 20, my libido dropped a lot, and sometimes I even struggled to get there. I’m not sure if it was stress or something else.

Now, at 20, I can reach orgasm normally, but if I try to cum once a day everyday it only comes out as a few drops, maybe around 30 max. It’s way less than before.

Why? Is this just because puberty ended? Is it normal for libido to drop after puberty?

I also suspect my testosterone might be low — my blood tests over the past three years show it decreasing. My last test was 272 ng/dL, with the minimum being 200.

Does this happen to you, guys? How often do you cum? Can you cum every day with a decent amount, or is it just a few drops like me?