I Can't Drink Now Like I Used to a Few Years Ago (26M), is that Normal?

I Can't Drink Now Like I Used to a Few Years Ago (26M), is that Normal?

During college and a few years after (maybe til 23/24) I drank almost weekly and don't get drunk that easily. In terms of beers, maybe I get tipsy at about 6 and give up at 10.

But now, I drink 2 and I get tipsy, and maybe tap out at 4/5.

Is that normal?