[6] Her appointments included that of Chair of the Advisory Groups for the English Longitudinal Study of Ageing (ELSA) and the New Dynamics of Ageing (NDA); and Chief Executive of the International Longevity Centre - UK, President of the Pensions Policy Institute and Honorary Vice President of the Royal Society for the Promotion of Health.

[citation needed] Greengross was an independent crossbench member of the House of Lords from 2000 until her death in 2022 and co-chaired five All-Party Parliamentary Groups: Dementia, Corporate Social Responsibility, Bladder and Bowel Continence Care, Social Care and Ageing and Older People.

Whilst Chair of the Association of Retirement Housing Managers, Baroness Greengross made the following statement in the House of Lords on 23 April 2012: "It is difficult, not least for the providers of schemes, who are dealing with people who are often prepared to spend 12 or more hours a day focusing on those issues and who can make amazing barrack-room lawyers – I do not want to be insulting – because they have so much time to concentrate on that.

Housing designed for older people whose needs change as they age faces an almost built-in conflict of interest.

"[citation needed] In 1959, she married Alan Greengross; the couple had three daughters and one son.