Health Protection Agency figures show a 60per cent increase in cases of chlamydia in 2008 in this age group, compared to 2004.
The popularity of online dating and surprising lack of sexual knowledge in older adults are contributory factors.
By her own admission, Judy Hollis's behaviour was thoughtlessly promiscuous.
'For a year,' she says, 'I fooled around, sleeping with more than ten men.
In short, our generation is more prepared to approach our last few decades with a new set of priorities - albeit sometimes unprepared for the problems that can accompany them.
Judy Hollis's story is not untypical of the dozens of women I've talked to about divorce and dating.
For me, in my 50s, the idea of taking my clothes off in front of a man who wasn't my husband was absolutely terrifying.
Having sex with a relative stranger, so easy when I was in my 20s, felt barely possible.
And these soaring figures are set to surge still further in the decade ahead, as women, in particular, feel less inclined to put up with flagging relationships. In my own social circle, I've witnessed at least a dozen marriage breakdowns in the past two years - including the demise of my own relationship after 25 years.
In two instances among my acquaintances, the men, both in their early 60s, have departed to a much younger woman beckoning from a warm bed.
And then, three months on, she did something completely unexpected and out of character: she started sleeping with other men.