Possible Clues:

• 29-Down's number, maybe
• Fabled slacker
• Super apartment, often
• In danger of being drafted
• Apartment number for many a building superintendent
• What Elvis Aaron Presley's middle name is spelled with on his birth certificate
• With 70-Across, vitamin bottle phrase
• First non-B.C. year
• Available for service
• Most eligible, to the SSS