The group certainly had cause to celebrate as it has already amassed more than 90 members in the space of just 12 months.
Chairwoman Lesley Gair cut the cake as members looked on and a presentation by two trainers of the British Red Cross followed.
U3A member Pat Greenshields said: “It was a really great day and everyone who was there thoroughly enjoyed themselves.
”It’s great to be part of such a vibrant group.”
The University of the Third Age (U3A) is an international organisation whose aims are the education and stimulation of retired members of the community.
U3A started in France in 1973, spreading worldwide and reaching the UK in the early 1980s.
The next meeting of the Lanark branch will be on Wednesday, November 14, at 2pm in Greyfriars Church Hall.