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 .

Question: How old might the narrator 's mom be ?
Options:
0. The narrator 's mom just celebrated her 41st birthday .
1. The narrator 's mom is 25 since the narrator just celebrated her fifth birthday .
2. The narrator 's mom might be a 60 year old woman who is starting to develop arthritis .
3. None of the above choices .
Answer: 2