Usually the golden age to someone is never the one they currently reside in. They set their standards by a time before them. I'm sure people back then in the golden age didn't think they were in the golden age.
Also double agree with Mr.Prower. To be honest, even if they appear, Tails and Eggman (as well as the people who don't even appear), IMO , you can tell are being downplayed in favor of Sonic. At this point, only Sonic seems important to Sonic Team.
but that's just my stupid opinion
Proud Member of the Tails fanclub. Tails go you cute little fox! Shout out to my big brother Miles Prower: Thanks for everything you do for me! My avatar is dedicated towards us. He is the best big brother ANYONE could ask for. Go Miles Prower!