The Spaniard produced a master class in approach play at Hong Kong Golf Club, in Fanling, to finish on 15 under par, one stroke clear of Fredrik Andersson Hed.
Six months older than Des Smyth was when he won the Madeira Islands Open in 2001, JimÃƒÂ©nez has now notched 19 victories on The European Tour, and 12 since turning 40 "“ with two coming in Hong Kong, in 2005 and 2008.
"This is a great place, and I love to come here every year," he said. "Since 2004, I haven't missed a year. I like the city, and especially I like the golf course.
"It's a golf course where length is not the most important thing. I just feel very comfortable out here, and that shows in my results."
Australian Marcus Frasers finished in third position and as a result has moved back to the top of the Asian Tour money list, this event jointly sanctioned between the Asian and European Tours.
Michael Campbell's return to form continued with an 8th place finish although having shared the lead into the final round he will be disappointed with his final day which included a double bogey at his final hole.
The event brought to a conclusion the chase for a place in this week's Dubai World Championship where Marcus Fraser will be the only Australian in the field. Fraser is currently in 25th position on the Race to Dubai money list.
Brett Rumford, who finished 40th this week, missed out on a place in Dubai by just one position.