Question: What age was the American social entrepeneur who was one of eight who got killed in 2015 when an Amtrak train travelling from Washington, D.C. to New York City derailed?

full_context: Document 1: Fairfield train crash: The Fairfield train crash occurred on May 17, 2013, when a Metro-North Railroad passenger train derailed between the Fairfield Metro and Bridgeport stations in Fairfield, Connecticut, in the United States. The derailed train fouled the adjacent line and a train heading in the opposite direction then collided with it. There were at 65 injured among the approximately 250 people on board each of the two trains. Metro-North reported damages at $18.5 million.
Document 2: Acela Express: The Acela Express ( ; colloquially abbreviated to Acela) is Amtrak's flagship service along the Northeast Corridor (NEC) in the Northeast United States between Washington, D.C. and Boston via 14 intermediate stops including Baltimore, Philadelphia, and New York City. The route contains segments of high-speed rail, and Acela Express trains are the fastest trainsets in the Americas; they attain 150 mph on 28 mile of the route.
Document 3: Jared Hecht: Jared Hecht is the co-founder and CEO of Fundera, an online small business lending aggregator. Prior to Fundera, Hecht co-founded group messaging app, GroupMe with Stever Martocci. After being live for 370 days, Microsoft purchased GroupMe for $80 million. Prior to GroupMe, Hecht was an early employee at Tumblr and led business development.
Document 4: Penn Line: The Penn Line is a MARC commuter rail line running from Union Station, Washington D.C. to Perryville, Maryland via Penn Station, Baltimore, Maryland on Amtrak's Northeast Corridor. It is MARC's busiest and only electric line. Currently the line is the fastest commuter rail line in the country, with trains running at speeds of up to 125 mph . The service is operated under contract by Amtrak which supplies employees to operate trains, and maintains the right-of-way and MARC's electric locomotives and passenger cars. The line is administered by MARC, a service of the Maryland Transit Administration (MTA).
Document 5: Keystone Service: Amtrak's 195-mile (314 km) Keystone Service provides frequent higher speed passenger train service along the Amtrak Philadelphia to Harrisburg Main Line between the Harrisburg Transportation Center in Harrisburg, Pennsylvania and 30th Street Station in Philadelphia. Most trains continue along the Northeast Corridor (NEC) to Pennsylvania Station in New York.
Document 6: Rachel Jacobs: Rachel Jacobs (October 3, 1975 – May 12, 2015) was an American social entrepreneur and CEO of a tech company. She was killed at age 39 in the 2015 Philadelphia train derailment while commuting between her home in New York and the Philadelphia offices of ApprenNet, the educational technology company she had recently joined as CEO.
Document 7: Northeast Regional: The Northeast Regional is a higher-speed rail service operated by Amtrak in the Northeastern and Mid-Atlantic United States. In the past it has been known as the "NortheastDirect", "Acela Regional", or "Regional". It is the busiest Amtrak route, carrying 8.04 million passengers in fiscal year (FY) 2013, a 0.4% increase over the 8.01 million passengers in FY2012. The "Northeast Regional" service earned over $568.7 million in gross ticket revenue in FY2013, a 6.2% increase over the $536 million earned during FY2012.
Document 8: Jon Cardella: Jon Cardella is an entrepreneur and businessman, who is best known as founder and CEO of GetVentive, NeighborCity and its parent company, American Home Realty Network. He formerly owned Ski West, which was sold to Overstock.com and renamed Overstock Travel in 2005. He was retained as CEO of Overstock Travel. He also served as CIO of FixYa.
Document 9: Atlantic City Express (Amtrak train): The Atlantic City Express was an Amtrak train that ran from both New York City and Washington, D.C. to Atlantic City, New Jersey, in the Northeastern United States. The train operated on the Northeast Corridor from New York City and Washington, D.C. to 30th Street Station in Philadelphia, Pennsylvania, where it went east to Atlantic City.
Document 10: Ric Elias: Ric Elias (born May 21, 1967 in San Juan, Puerto Rico) is the co-founder and CEO of Red Ventures (private), a leading digital consumer choice platform headquartered in the Charlotte, North Carolina region. Elias was a survivor of Flight 1549, an event which drastically changed his life and led to his widely viewed Ted Talk “3 things I learned while my plane crashed.” A recipient of Ernst & Young's Entrepreneur of the Year Award, Elias is cited as aspiring to create the “Google of the East Coast” within his company’s culture and facilities.
Document 11: Amtrak's 25 Hz traction power system: Amtrak's 25 Hz traction power system is a traction power grid operated by Amtrak along the southern portion of its Northeast Corridor (NEC): the 225 route miles (362 km) between Washington, D.C. and New York City and the 104 route miles (167 km) between Philadelphia and Harrisburg, Pennsylvania. The Pennsylvania Railroad constructed it between 1915 and 1938. Amtrak inherited the system from Penn Central, the successor to Pennsylvania Railroad, in 1976 along with the Northeast Corridor. This is the reason for using 25 Hz, as opposed to 60 Hz – which is the standard for power transmission in North America. In addition to serving the NEC, the system provides power to New Jersey Transit Rail Operations (NJT), the Southeastern Pennsylvania Transportation Authority (SEPTA) and the Maryland Area Regional Commuter Train (MARC). Only about half of the system's electrical capacity is used by Amtrak. The remainder is sold to the commuter railroads who operate their trains along the corridor.
Document 12: Rachel Ewald: Rachel M. Ewald is the founder and chairwoman of Foster Care Support Foundation, Inc. The Foster Care Support Foundation FCSF is a 501(c)3 non-profit organization that provides clothing, equipment, and toys to at least 3000 foster and displaced children throughout the state of Georgia annually. The services are free for those raised on basic state per-diem and for grandparents and relatives raising their grandchildren, nieces or nephews without the biological parent/s present in the home. In 1996, Ewald began collecting and distributing clothing and toy donations from neighbors to give to local foster children in need. The program and need grew quickly and the Foundation was incorporated in 2000. Ewald, a foster parent herself of fourteen years to over 50 children and mother of four biological children, understood the difficulty of raising a child on fifty to seventy five cents per hour. The center allows for more foster parents to afford to care for state children, while also allowing the children to acquire their own clothes, toys, and be much like any other child after losing everything when pulled from their biological homes. The organization's donation/distribution center, located at 115 Mansell Place in Roswell GA is set up like a retail store and is fully stocked with clothing, toys, bikes, highchairs, and other necessities, where foster parents throughout the state can come, by appointment, and shop for free. Rachel Ewald has also written a set of transition guidelines "Healthy Children, Healthy Adults" for foster care and adoption, with the intent of reducing disruption and trauma in foster and adoptive home and when reunifying children with their biological families.
Document 13: Robin Chase: Robin Chase is a transportation entrepreneur. She is co-founder and former CEO of Zipcar. She is also the founder and former CEO of Buzzcar, a peer-to-peer car sharing service, acquired by Drivy. She also started the defunct GoLoco.org, a ride-sharing company. She is co-founder and Executive Chairman of Veniam, a vehicle network communications company. She authored the book, Peers Inc: How People and Platforms are Inventing the Collaborative Economy and Reinventing Capitalism.
Document 14: R.J. Corman Railroad Group: R.J. Corman Railroad Group, LLC is a privately owned railroad services and short line operating company headquartered in Nicholasville, KY, with field locations in 23 states. It was owned by Richard J. Corman, who established the company in 1973, and ran it until his death on August 23, 2013. The company owns eleven short-line railroads spanning Indiana, Kentucky, Mississippi, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, Texas, and West Virginia. The company serves all seven Class I railroads, many regional and short line railroads as well as various rail-served industries. These operations encompass an array of services, including: railroad construction, short line railroad operations, dispatch, industrial switching services, emergency response, track material logistics, distribution centers, signal design and construction, building eco-friendly locomotives, railroad worker training and an excursion dinner train.
Document 15: 2015 Philadelphia train derailment: On May 12, 2015, an Amtrak "Northeast Regional" train from Washington, D.C. bound for New York City derailed and wrecked on the Northeast Corridor in the Port Richmond neighborhood of Philadelphia, Pennsylvania. Of 238 passengers and 5 crew on board, 8 were killed and over 200 injured, 11 critically. The train was traveling at 102 mph in a 50 mph zone of curved tracks when it derailed.
ground_truth: 39