LOS ANGELES (Reuters) -- Actor Ashton Kutcher, whose May-December romance with screen star Demi Moore has riveted the tabloids for months, is producing a Fox TV sitcom pilot inspired by the couple's recent real-life marriage.The show, about a man closer in age to his eldest stepdaughter than his bride, is "loosely based" on Kutcher's new blended-family life, 20th Century Fox Television spokesman Chris Alexander said on Tuesday.The show, tentatively titled "30-Year-Old Grandpa," would be set in Chicago, and neither of the two lead characters are entertainers. Instead it centers on a 30-year-old nightclub owner and a 40-something businesswoman who get married and discover they're expecting a child.At the same time, the woman's 22-year-old unwed daughter announces she is pregnant and plans to move home to raise her baby -- turning the show's leading man into a grandfather overnight.The woman's younger daughter, who had been living with her father, decides she, too, wants to live with mom and the new stepdad."It becomes a very modern, messy look at an extended American family," Kutcher's producing partner, Karey Burke, told Daily Variety.Like the fictional club owner in his sitcom pilot, Kutcher, 27, became a stepfather when he tied the knot last month with Moore, 42, who has three daughters -- aged 11, 14 and 17 -- from her previous marriage to actor Bruce Willis.Kutcher and Moore are not known to be expecting children, but the actress said in a recent Harper's Bazaar magazine interview that she wanted to expand their family.Moore, who starred in "Ghost," "G.I. Jane" and "Striptease," began dating Kutcher in 2003, as she was making a highly publicized return to the screen in "Charlie's Angels: Full Throttle."Kutcher, whose break came as a star on television's "That '70s Show," is co-creator of the MTV reality show "Punk'd." His films include "Guess Who" and "Dude, Where's My Car?""30-Year-Old Grandpa" is one of several pilot comedies being developed as possible future additions to the Fox prime-time schedule.No casting decisions have been made. Alexander said he doubted that either Kutcher or Moore would appear in the series, but added, "I suppose anything is possible."Both the Fox network and its sister TV studio are units of News Corp. Ltd Copyright 2005 Reuters. All rights reserved.This material may not be published, broadcast, rewritten, or redistributed.