There are 3 books in the Hendrik Groen series. The newest book is Two Old Men and a Baby which came out in 2021.

1
The Secret Diary of Hendrik Groen

By Hendrik Groen , Hester Velmans (translator) ,

Book cover of The Secret Diary of Hendrik Groen

The hilarious international bestselling novel that has had pensioners ditching their sticks and zimmers to follow the age-defying, youth inducing antics inside The Secret Diary of Hendrik Groen, 83 1/4 Years Old . . .

'Terrific. This geriatric Adrian Mole made me laugh' Woman and Home

'Funny and touching' BBC…

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2
On The Bright Side

By Hendrik Groen , Hester Velmans (translator) ,

Book cover of On The Bright Side

Eighty-five-year-old Hendrik Groen is fed up to his false teeth with coffee mornings and bingo.
__________

Along with fellow members of the Old-But-Not-Dead Club, he embarks on a wild spree of octogenarian anarchy. But the home's director will not stand for any more drunken bar crawls, illicit fireworks or geriatric…

3
Two Old Men and a Baby

By Hendrik Groen , Hester Velmans (translator) ,

Book cover of Two Old Men and a Baby
Nine years before the events of the #1 international bestseller The Secret Diary of Hendrik Groen, 83 ¼ Years Old, Hendrik and his best friend Evert embark on a madcap adventure—with an unexpected guest.

Hendrik Groen and Evert Duiker, faithful friends in good and bad times, are well over seventy…