Wahlgren grew up in Smedslätten, and debuted in 1945 in
Ragnar Falck's
short film Indianer och blekansikten. His breakthrough came in the film
Raggare in 1959. During eleven seasons he performed in the revue Hagges Revue in
Gothenburg. In the revue he did impressions of famous people like
Jan Malmsjö,
Jarl Kulle,
Carl XVI Gustaf and
Claes af Geijerstam. and in
Charleys tant and
Spanska flugan at
Vasateatern. He also did plenty of voice acting in several films such as
Charlie and the Chocolate Factory and
Nanny McPhee. He provided Charles Ingvar "Sickan" Jönsson's voice in the computer games '
and '. Between 2016 and 2024, Wahlgren participated in his daughter
Pernilla Wahlgren's reality series
Wahlgrens värld which is broadcast on
Kanal 5 and the streaming service
MAX. ==Personal life==