Keith's note: I am not sure what to make of this comment by Charlie Bolden. Either he is very confused or someone is giving him really stupid talking points. Let's see, where do I start: how "old" is SLS technology? The Solid Rocket Boosters SLS uses are stretched and improved versions of the same design that Space Shuttles flew beginning in 1981 - but were designed in the 1970s (source). Oh, and SLS uses re-flown Space Shuttle Main Engines (RS-25) which were also designed in the 1970s (source). And, FWIW Bolden flew these vehicles multiple times in the 80s.
SpaceX vehicles and engines were designed in the 21st century, use advanced manufacturing technology and require an ever-shrinking number of people to launch. Instead of re-using the reusable SSMEs on SLS, NASA will throw them away whereas SpaceX can use their first stages over and over and over again - after they wash the soot off the rocket, that is.
Board member: why is NASA developing SLS when SpaceX has heavy-lift plans? Boldne counters that SpaceX's Falcon 9 uses "old technology."— Jeff Foust (@jeff_foust) April 26, 2016