The song is a little known song by the Kinks. The lyrics are:

Picture yourself when you?re getting old,
Sat by the fireside a-pondering on[? ].
Picture book, pictures of your mama, taken by your papa a longtime ago.
Picture book, of people with each other, to prove they love eachother a long ago.
Na, na, na, na, na na.
Na, na, na, na, na na.
Picture book.
Picture book.

A picture of you in your birthday suit,
You sat in the sun on a hot afternoon.
Picture book, your mama and your papa, and fat old uncle charlie out cruising with their friends.
Picture book, a holiday in august, outside a bed and breakfast in sunny southend.
Picture book, when you were just a baby, those days when you were happy, a long time ago.
Na, na, na, na, na na.
Na, na, na, na, na na.
Picture book.
Picture book.
Picture book.
Picture book.

Picture book,
Na, na, na, na na,
Na, na, na, na na,
A-scooby-dooby-doo.
Picture book,
Na, na, na, na na,
Na, na, na, na na,
A-scooby-dooby-doo.

Picture book, pictures of your mama, taken by your papa a long
time ago.
Long time ago,
Long time ago,
Long time ago,
Long time ago,
Yeah, yeah, yeah.