The 89-year-old is wheelchair-bound after a 2008 fall, and last year sold off the USD 18.4 million US home he shared in the UK capital with his wife Sheila Sim after deciding it was not "practical" to keep the mansion, reported Daily Mirror.
Sim was moved to a care home after she diagnosed with senile dementia, and now Attenborough has joined her in the facility.
"The family home has been sold and he has been at a care home with his wife since then," son Michael said.
He won an array of awards, including eight Oscars for 'Gandhi'.