*We’re definitely in a new age where dating someone 10, 20 or even 30 years older (or younger) isn’t so taboo. But the Jackson family dad is seriously robbing the cradle.

Joe’s got a new girl who is 51 years younger, and happens to be wealthy and Indonesian, so reports the Daily Star out of the UK.

Miss Lavinia Iskandar, 33, has been spotted hanging with the 84 year old patriarch of the Jackson family since April.

While she’s a familiar face these days, their relationship has been pretty much a secret until now.

A source tells the Daily Star that the pair has been seeing each other for some time and that she stays in Joe’s Las Vegas condo.

“He hasn’t seen his wife Katherine in weeks, and simply wasn’t around during the recent drama about Michael’s estate when she was spirited away to a spa in Arizona, ­leaving his children home alone.”

But the source also said Katherine is numb to the whole union.

However, Joe’s spokesman says Lavinia is simply a business associate he is working with for a new product to market in Asia.

Despite the denial, Joe isn’t known to be an honest man. He’s actually confessed to fathering two children, one in 1972 and 1974 with two different women.