Risky Mathematics

An elderly woman asks her husband: Darling, honestly, if you didn't know me, what age would you say I am?

Looking over her carefully, he replies: Judging from your skin, twenty; your hair, eighteen; and your figure, twenty five.

“Oh, you flatterer!” she gushed.

“Whoa, hold on there sweety!” he interrupted. “I haven't added them up yet!”