Mathematical Problem 4: ages and birth years

It's my wife's birthday on Wednesday. Christina will be 66. In October, our daughter, Catherine, will be 44. Now, Christina was born in 1944 and Catherine was born in 1966.

So, daughter born in '66, mother in '44. And in the year that mother turns 66, daughter turns 44!

That's neat, isn't it! "What are the chances of that happening?" Mrs Haylock asked her mathematical husband in the car yesterday.

What do you think? Is it a rare coincidence?