The author and playwright detailed his worsening health since open heart surgery last year in his annual diary for the London Review Of Books, this year titled A Round Of Applause.
The 86-year-old, originally from Armley in Leeds, said he had difficulty climbing the stairs of his home in Primrose Hill, north London, due to arthritis and a number of recent falls.
He wrote that he had also given up cycling, a lifelong passion, and now barely manages a three-minute walk around his block using a walking stick.
Bennett apologised to readers for dwelling “so much on my physical incapacity”.
He added: “Farewell to the bike has to some extent meant farewell to the health that went with it, and my life is increasingly medicated.”
But writing about the stairlift, he quipped: “I never thought I’d say it, but I wish we had a stairlift (as famously advertised by Thora Hird).
“I come downstairs in the morning and don’t go back up until I go up for my bath before supper. All this has happened since I had to give up my bike.
“We won’t ever get a stairlift for aesthetic reasons, but how long I will be able to continue walking is an open question and a pressing one.”
His Talking Heads television monologues were revived by the BBC earlier this year, raising about £1 million for NHS charities.
Among the stars to appear in the adaptations were Martin Freeman, Jodie Comer and Imelda Staunton.
Bennett said: “I must cost the NHS a fortune, and I’m glad that through Talking Heads we were able to repay some of that.”
The History Boys writer has previously been treated for colon cancer and for an aneurysm, a swollen blood vessel, in his abdomen.