Question: what is the age requirement of one of the group which run  The Co-operative Travel as a joint venture 

Context paragraphs:
Clarity Travel Management: Clarity Travel Management provides travel services in the United Kingdom, and was a partially owned subsidiary of The Co-operative Group until 2014.  It was sold to a subsidiary of the Al Tayyar Group during that year.  The company rebranded from Co-operative Travel Management to Clarity Travel Management in March 2015.  As part of the new rebrand, the firm has so far invested over £500,000 in technology and software.

Tiwest Joint Venture: The Tiwest Joint Venture was a joint venture between Tronox Western Australia Pty Ltd and subsidiaries of Exxaro Australia Sands Pty Ltd.  The Tiwest Joint Venture was a mining and processing company, established in 1988, to extract ilmenite, rutile, leucoxene and zircon from a mineral sands deposit at Cooljarloo, 14 km north of Cataby, Western Australia.  As of June 2012, the joint venture was formally dissolved, when Tronox acquired the mineral-sands-related divisions of Exxaro outright.

Joint venture broker: Joint venture brokers are people who connect business joint venture partners together for profit making projects.  The joint venture brokers will earn a pre-negotiated percentage of the profits earned from the joint venture that they helped put together.

Canadian Intermountain Joint Venture: The Canadian Intermountain Joint Venture (CIJV) is a partnership of "government agencies, Aboriginal groups, nongovernmental organizations, industry, universities and landowners" for the implementation of the North American Waterfowl Management Plan in the inter-mountain areas of south and central British Columbia in Canada, and the south-western mountain region of Alberta.  Its region of operation includes "all the mountain national parks", with boundaries delineated by the border with the United States to the south, the eastern crest of the Rocky Mountains to the east, the crest of the Coast Mountains to the west, and the boreal forest to the north.  It is adjacent to the Intermountain West Joint Venture to the south, the Pacific Coast Joint Venture to the west, and the Prairie Habitat Joint Venture to the east.

The Co-operative Group: The Co-operative Group, trading as The Co-op, is a British consumer co-operative with a diverse family of retail businesses including food retail; electrical retail; financial services; insurance services; legal services and funeralcare, with in excess of 4,200 locations.  It is the largest consumer co-operative in the UK and owned by more than 4 million active members.  Membership is open to everyone aged 16 and over in the society, provided they agree to subscribe £1 sterling in the capital of the society out of their first share of the profits and share the values & principles upon which the group was founded.  Members are democratically involved in setting business strategy, decide how social goals are achieved, and share in its profits - in the 2016 £19m was returned to members and their chosen local community causes via the 5+1 scheme.  No year end dividend was paid in 2015.

Co-operative Travel Trading Group: The Co-operative Travel Trading Group (or CTTG) was the central buying group for co-operative travel agents in the United Kingdom.  It was established along the same lines as the Co-operative Retail Trading Group when the Co-operative Group merged its own five travel operations in 2003.

Sevel: Sevel is an acronym of "Société Européenne de Véhicules Légers" (European Light Vehicle Company), established in 1978 by PSA Peugeot Citroën and Fiat for a joint venture of factories building cars for both carmakers.  Formerly, Alfa Romeo, Lancia and Talbot were also part of the joint venture.  Sevel Argentina was its subsidiary.  Sevel Sud in Italy began manufacturing in 1981.  Sevel Nord in France started in 1993.  Fiat sold its share of Sevel Nord to PSA in 2012.  A joint venture extension for Sevel Sud sees joint manufacturing remaining there until 2019.

Pacific Birds Habitat Joint Venture: The Pacific Birds Habitat Joint Venture (PBHJV), previously Pacific Coast Joint Venture is a partnership established in 1991 between governments, organizations, and conservation groups along the Pacific Coast of the United States and Canada, established to protect and enhance wetlands important to migratory birds, within the framework of the North American Waterfowl Management Plan (NAWMP).  Participants include the provincial government of British Columbia in Canada, and the state governments of Alaska, California, Hawaii, Oregon and Washington in the United States.  The venture's scope covers an area from San Francisco Bay to Alaska, west of the Coast Mountains, and it was the first joint venture of the NAWMP to have an international scope.

Sachtleben Chemie: Sachtleben Chemie is a major chemicals producer, with its primary focus on the production of white pigments, fillers and extenders.  The company employs some 2,200 persons and achieves annual sales of around 820 million euros (2012).  Sachtleben has been a member of the multinational Rockwood Holdings, Inc. group since 2004.  In September 2008, Rockwood Holdings, Inc. entered into a joint venture with Kemira Oyj, of Finland, combining Rockwood's titanium dioxide and functional additives activities (with production based in Duisburg, Germany) and Kemira's titanium dioxide business (with production at Pori, Finland).  This joint venture immediately became one of the world's leading producers of titanium dioxide pigments.  Production capacity for these specialties increased by a further 100,000 t/a, to 340,000 t/a, with the acquisition in 2012 of the facilities of the insolvent Crenox GmbH competitor, a former Bayer subsidiary, in Krefeld.  Rockwood Holdings, Inc. acquired Kemira's stake in the joint venture in early 2013.  Sachtleben is thus a 100% subsidiary of Rockwood Holdings, Inc.

The Co-operative Travel: TCCT Retail Limited, trading as The Co-operative Travel is a travel agent in the United Kingdom, run as a joint venture between the Thomas Cook Group, The Co-operative Group and Central England Co-operative.  TCCT Retail is based at the Peterborough Business Park at Lynch Wood, Peterborough.  It is a member of ABTA and holds an ATOL licence; it also acts as an agent for licensed Tour Operators.  The brand is also used by independent retail co-operatives, through their access to The Co-operative brand.

Supporting paragraphs: The Co-operative Travel The Co-operative Group
Answer: aged 16