Adults, men, women, people, gentlepersons...
developed, grown, of age, ripe, adult, elder, tall
There is no specific collective noun for 'grown-ups'. Grown-ups is another word for people, the collective noun would be whatever is appropriate for the context of the grown-ups that you're talking about. For example, a council of grown-ups, a team of grown, a crew of grown-ups, a party of grown-ups, a mob of grown-ups, etc.
5"10
DVD on TV - 2003 Grown Ups 9-5 was released on: USA: 28 January 2013
Grown Ups - 1999 Bachelor Auction 1-5 was released on: USA: 20 September 1999
Grown-Ups was created in 1980.
BBC2 Playhouse - 1974 Grown-Ups 7-5 is rated/received certificates of: Australia:M UK:12 (DVD rating)
Grown ups
maybe there will be a grown ups 3
Grown Ups was released on 06/25/2010.
The Production Budget for Grown Ups was $75,000,000.
Grown ups is two words.