Should I Get My Cat A Buddy?

Hello all!

I have one marvelous cat and her name is Margo. However, she spends all day alone. She doesn't seem to mind, but she does love to cuddle and play as soon as I get home. 

Should I think about getting Margo a friend, a new cat buddy for her to play with?

How old is she now? How old was she when you got her?

Margo is 4, and I have had her for 4 months