They have both been married to their husbands for a long time; Mary is upset because she thinks her husband doesn’t find her attractive anymore.
“As I get older he doesn’t bother to look at me!” Mary cries.
“I’m so sorry for you, as I get older my husband says I get more beautiful every day.” replies Jane.
“Yes, but your husband’s an antique dealer!”
Another funny joke posted by crazyfortaco, originally seen on Reddit.