Coleman and Wales made it to the semi-finals of Euro 2016 last summer and are now in with a huge chance to qualify for the World Cup for the first time since 1958.
There are a number of games taking place on Monday and depending on the results, Wales could qualify automatically, go into a play-off, or miss out on football's showpiece event in Russia altogether.
Speaking ahead of his side’s crunch match against the Republic of Ireland, Coleman said: "It is a golden era because they (the players) proved that it is a golden era."
"They were labelled a golden bunch of players before we qualified (for Euro 2016) and I fought against that because they had not earned that tag.
"But they have earned it now. This group of players have made a difference, and they have gone one step further than anybody else that has come before them."
Coleman also wanted to tell his player to enjoy such an occasion.
"There is nothing to fear, nothing to worry about," he added. "We have got to make sure the players enjoy the experience.
"They have created this situation, where the excitement in the country is incredible. They must not forget to enjoy it also.
"It is as big as anything we have been involved in. We've got to wear the jersey and give everything you have got.
"I can forgive our players for anything but I can't forgive them if they don't empty on the pitch when they put the jersey on. They always do."