Based on the context and the answer, generate a question. 

Context: Dear Cara , You turned 4 months old on Friday ! We had a very busy day with playgroup , the doctor and a long walk with Daddy , so I expected to write your letter in the evening . This plan did not take into account your 4 month shots that afternoon . Those nasty , mean , vile shots made you very upset so my whole evening was spent comforting you .

Answer:

Cara is less than a year old .



How many years old is Cara ?