Is much older than I thought

I met my girlfriend ten years ago, and she said she was 42. Well, I just looked at her birth card and see she was born in 1960 making her FIFTY-TWO! SO She lied LIED to me!!! But I love her so much and for 10 years and the only reason I didn't marry her yet that my sister is planning a wedding of her own and I don't want to be too much for my parents. Besides, we wouldn't be able to have babies b/c her age but I guess we could adopt some babies... I don't really care about the babies so much. Anyway, what bothers me is not she's 10 years older but she LIED!! Is this a red flag because in 10 years we never had ever any other problems between each other besides fighting over swtupid things like TV remote. Should I stay with her, talk with her, break up with her, or what?

Well, if ten years ago she was 42, it would stand to reason that ten years later she would be 52.