Extraordinarily debatable, genetic wise if you’re European you generally won’t have issues with dairy processing until your late 60s.

Northern European ancestry can drink a lot of milk their whole life, although somewhat less as they get older.

Everybody else better take their lactase or only small amounts at a time.

there are ways to get rid of lactose through filtration and fermentation, if anything, one should be concerned about hormones they pumped into cows to produce milk on top of the naturally produced hormones meant for baby cows to grow big and fast