The 'remote' aspect is the complicating factor but the basis of this is no different to other services.

At the shop cash tills I noticed recently a sign that said "if you're purchasing alcohol and are fortunate enough to look under 25 we will need to age check you" (or some very similar words).

Same goes for anyone buying solvents and glues, or knives and blades, vapes, etc.

The aim is good - the challenge is the implementation.

Only feasible way seems to be prove you're older than the minimum (which feels like persecuting those that are old enough) rather than prove you're too young!