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

Context: Mum said she did so much walking she had to take pain killers for her knees . I keep forgetting she 's not as young as she used to be . Afterwards I hopped on a 141 and was soon near the Orwell . For a long time I was the only one there but after quite a wait Iain , Paul and Glenn walked in . By now Laura ( the owner ) was here , so people said happy birthday and there was food and cake .

Answer:

The narrator 's mom might be a 60 year old woman who is starting to develop arthritis .



How old might the narrator 's mom be ?