I wanted to establish a lower limit on Marcone's apparent age via Priscilla's timeline, text, and WOJ's. I say lower limit because as we have seen with Sarissa, Wizards, etc apparent age can be drastically different than actual age. Much of this is brought over from the Harry/Marcone Relationship thread as I believe discussion focused on his age is more appropriate in its own thread.
Establishing lower limit on Marcone's age via Priscilla's timeline to include events surrounding Amanda Beckitt.
Amanda's birth via Priscilla's timeline prior to Storm Front
~13-17 14* BSF: Amanda Beckitt born. [Age:0]
[2,4-7* 3 years BSF] What I could see was the Beckitt family. Husband, wife, daughter, a little girl maybe ten or eleven years old. [Age: 10-11]
She is "in her late teens or early twenties" in DM which takes place about 3 years after SF. [Age 18-23] [~16-17]
Murphy's jaw tensed, little motions at the corners of her face. Then she said, "Greg and Helen Beckitt. Three years ago, their daughter, Amanda, was killed in a cross fire.
Johnny Marcone's thugs were shooting it out with some of the Jamaican gang that was trying to muscle in on the territory back then. One of them shot the little girl. She lived for three weeks in intensive care and died when they took her off life support."
I didn't say anything. But I thought of Mrs. Beckitt's numb face and dead eyes.
"The Beckitts attempted to lodge a wrongful death suit against Johnny Marcone, but Marcone's lawyers were too good. They got it thrown out before it even went to court. And they never found the man who shot the little girl. Word has it that Marcone offered to pay them blood money. Make reparation. But they turned him down."
~3-4 BSF: Marco Vargassi decides Marcone has become a threat to his father Tony's organization and tries to stage his death. Amanda Beckitt, daughter of Helen and Greg, is shot. She is about 10 or 11 at the time, and she is in her late teens to early twenties in DM. Tony Vargassi bribes the medical examiner to forge Amanda's death certificate to protect his son. The Vargassis are still in power at the time of "Restoration of Faith."
~2-3 BSF: Marcone learns of Amanda Beckitt, two years after her "death." per Marcone in DM
~2 BSF: Marcone topples the Vargassis and founds his own empire.
Now for Marcone
@BillyYank Marcone was a Marine. [Age>17 when he entered service]
I looked over my shoulder to see a very, very young-looking Marcone.
He wasn't wearing a business suit. He had on jeans and a black leather jacket. His hair was longish, a little mussed, and he also sported a stubble of beard that gave him the kind of rakish look that would attract attention from the girls who fantasized about indulging with a bad boy. [Age:?] [BSF]
"Gentleman" Johnny Marcone had been the thug to emerge on top of the pile after the Vargassi family had dissolved into internal strife. The police department saw Marcone as a mixed blessing, after years of merciless struggle and bloody exchanges with the Vargassis.
SF: Marcone's appearance during first Harry/Marcone encounter
Gentleman Johnny Marcone didn't look like the sort of man who would have my legs broken or my jaw wired shut. His salt-and-pepper hair was cut short, and there were lines from sun and smiling etched into the corners of his eyes. His eyes were the green of well-worn dollar bills. He seemed more like a college football coach: good-looking, tanned, athletic, and enthusiastic. The impression was reinforced by the men he kept with him.
Harry's Age 25@SF per Priscilla timeline.
25 BSF, October 31: Harry is born. Harry's mother, now Margaret Gwendolyn Dresden, dies in childbirth. She is murdered by a ritual entropy curse, courtesy of Lord Raith. [Harry's Age SF=25]
Based on time of shootout, estimate of Amanda's birth, Harry's birth, and Marcone involvement in a shootout 2-7BSF at age no earlier than 18, I estimate that Marcone is at least 6-10 years older than Harry.
Priscilla's Timeline
http://www.jimbutcheronline.com/bb/index.php/topic,1592.0.html