I thought it would be that as well. But I went quite a while, probably almost two years, without ingesting milk at all. And I just had my 34th birthday two weeks ago. I figured there’s just no way I can still process milk and it turns out I absolutely can. No issues at all. Reading into it, it seems to be genetic.

https://medlineplus.gov/genetics/condition/lactose-intoleran...

You just either get the right genes or you don’t. I’m curious as to how long into my life I’ll be able to drink straight cow milk and be fine. Still got a bit of experimental time left. Hopefully, anyway.

Also both my parents can drink milk without issues.