Any of you dare to pop over to Mumsnet to ask the same question? I bet the answers would be very different from ours!
So much of 'age' is in the eye of the beholder.
On Saturday, one of the guests at DS2's wedding, who I'd never met before, came over to say goodbye and thank you to me for a lovely evening, and told me that I reminded her of her grandma. I'm only 54 ffs, but I can only conclude that to her (probably in her late twenties), I am 'old'! 
Btw, in case you are wondering how I responded to her would-be compliment, I just smiled sweetly, put on my best 'old lady' voice and said, 'Oh, how sweet!' The family laughed their heads off when I told them about it later 