How old is too old to start a writing career? (Or, to put it another way, just how ageist is the publishing world?)Very.
But you don't need to tell anyone how old you are, or how old you're not.
The timing of this post is not random. It's in honor of my mum (today is her birthday), who had gray hair at a very young age. When she was old enough that gray hair was no longer an exception to the rule, she was often treated as a senior citizen even though she was not 65. Or even 60.
But Mum was a thrifty sort. When asked if she'd like a senior discount, her thriftiness fought with her innate honesty. She lit upon the perfect response "why not?" which wasn't a lie, and got her the discount.
We laughed about it for years.