The University of the Third Age  or U3A as  it is affectionately known  is an international organisation  run by it’s unpaid  volunteer ,mostly retired, members for their own edification and obvious joy.  There is no age limit either way ( ie young or old) It is a place where anyone of any age can come to learn.
It was originally founded in 1973 in Toulouse , France  and now operates all over Europe, Canada, Australia  and the Commomwealth.
 
There are now approximately one thousand  U3As  branches in  the UK, and approximately half a million members , all entirely  self funded
 
There are no exams  or qualifications  , just pure enjoyment in learning and sharing with like minded people in a relaxed and friendly setting. The “students” teach each other drawing on their own knowledge and skills ; subjects covered would be similar to any university  so the curriculum is pretty exhaustive.

 Many of the tutors are extremely well qualified – some tutors have none at all  but have a great talent for imparting knowledge in their chosen subject.

The London Hampstead branch also has a regular film society and Monday talks
 

Old Town Hall,
213, Haverstock Hill,
London NW3 4QP

https://www.u3alondon.org.uk/ 3 minutes Belsize park tube