In electronics... over 10 years IS considered extremely old, in fact at that time ( 2008 ), it was considered old tech even then with many of the radio manufacturers starting to adopt 2.4...
Spectrum introduced the first 2.4Ghz systems back in 2004 using their DSM technology. I think JR further developed DSM and added frequency hopping around 2007 dubbing it DSM-J. Futaba joined in about 2011 with their 2.4Ghz FASST system addressing some of the issues seen in Spectrum's implementation and was later developed into FHSS which has the same reliability that FASST brought but was able to be implemented at a lower cost. I couldn't find out when Hitec jumped on the bandwagon but it was after Futaba if I recall correctly.
Spectrum's initial implementation of DSM really only had two issues ( that have now long been addressed ). First was the receiver had a cheaply implemented power circuit that was prone to brown outs. The second was it's lack of frequency hopping, it would select only 2 channels on startup and then if those got busy, it'd again loose connection. As mentioned, these have since been addressed and now most if not all companies use some sort of frequency hopping technology that allows them to almost completely avoid most interference issues that are seen by any older AM/FM band radios that rely on single channel frequencies.
AM radios do still have a reason to exist... they are capable of long distance control where FM is line of site. Noisy electronics, electric motors ( from drills to oil well motors ) and in some cases even large engines still can take down any AM/FM based radio... Just crashing once is enough to pay for any lower cost 2.4Ghz system which can avoid those pit falls.