As far as allowing <21 is concerned, perhaps in the quoted post, but the fact is that some hotels require that you be 21 or older to check-in, including these two Aloft properties in California, which answers the OP.

But, if you like I can go back and pull up the other four or five Alofts I found where being <21 is perfectly fine to check-in and insert those instead.

Best regards,

William R. Sanders
Social Media Specialist
Starwood Hotels & Resorts Worldwide

[email protected]