Once in a Lifetime - 1994 TV is rated/received certificates of:
Australia:PG (DVD rating)
Australia:M (cable rating)
UK:PG
Once in a Lifetime - 2009 II is rated/received certificates of: Greece:K
Only Once in a Lifetime - 1979 is rated/received certificates of: Iceland:L USA:PG
Once in a Lifetime - 1932 is rated/received certificates of: USA:Approved (PCA #3158) (24 February 1937)
Medium - 2005 Once in a Lifetime 6-8 is rated/received certificates of: Netherlands:12
Eureka - 2006 Once in a Lifetime 1-12 is rated/received certificates of: Australia:M USA:TV-PG
Once and Again - 1999 Chance of a Lifetime 3-19 is rated/received certificates of: Argentina:13
Once in a Lifetime The Extraordinary Story of the New York Cosmos - 2006 is rated/received certificates of: Australia:M Ireland:12A Singapore:PG USA:PG-13
Pie in the Sky - 1994 Once a Copper 1-4 is rated/received certificates of: Australia:PG UK:PG (video rating) (2005) (2011)
Hugh Hefner Once Upon a Time - 1992 is rated/received certificates of: UK:15 USA:R
Once in a Million - 1935 is rated/received certificates of: UK:U
Once an Eagle - 1976 is rated/received certificates of: Singapore:PG
Once a Thief - 1935 is rated/received certificates of: UK:A