Gold is said to, more or less, end with the beginning of the 50s; definitely by the Kefauver Hearings. Silver kind of picks up there, with either the debut of Martian Manhunter or the Flash, depending on point of view. It is said to end around 1970, with the Death of Gwen Stacy and the Green Lantern/Green Arrow stories as kind of a demarcation. Bronze is one that has been argued and changed, quite a bit. It picks up from silver; but, it used to be said to end with the beginning of the 80s and that the Modern Age began there. Later, it stretched further into the 80s. Modern Age was in use by the late 80s, post-Dark Knight and Crisis. In the 90s, people started bandying about terms for the speculator frenzy going on, with the companies replying with pointless gimmicks; but, most of that was criticism of the phenomena, rather than trying to define the era of storytelling. Modern Age kind of continued to be in use, into the New Millennium.

The 50s, 70s and 90s are all big transitional periods, when you think about it. With the war over, the superheroes kind of die off (or at least the herd is culled) and comics focus on other genres more. By the 60s, with the Space Race and the sense of optimism, heroes are given a go, again. By the mid-60s, they have taken over. The 70s saw a big transition in how comics are bought and sold, which did much to alter publishing. Things weren't selling, so companies experimented, trying to find an audience. meanwhile, an alternative market had been growing and that became a saving force, which allowed the Big Two to better market to a specific audience, while also creating a playground for other companies to present alternative material. By the 90s, the Big Two were squeezing the little guys off the stands and speculators were dominating the market. A lot of the indies ran into cash flow problems and started shutting down, while comic shops over-extended and went bust. Marvel touched off a distribution war that killed even more indies and comic shops, as well as Capital Distribution, which was always more supportive of smaller companies. It also led to Marvel's bankruptcy.

Really, I think it is probably better to look at each decade of comics, when discussing patterns of publishing and buying, as most seem to last about 10 years, with a bit of overlap.

IMO the Golden Age was 1938-1948. Then Atomic Age 1948-1956. The Silver Age in 1956-1969. Then the Bronze age 1970-1985. Beyond 1986 I have no idea...modern, copper, etc.

For me it was 14.

My view would be whatever era carries the most meaning for you, whether it is a greater love of the stories, or more material that appeared, or whatever meant the most to you.  For me, That would be from around 1978/79 to about 1998.  That was when I was earning my own money and able to read and collect comics in greater breadth and quantity.  For sheer love of the material, it would be from about 1985 to 1996.  That was my peak period for new material and experimentation with indie comics.  I always read anything I could get my hands on; but, was mostly reading adventure material, by the 80s.  Once I got to college and had regular access to a decent comic shop, I started to explore all kinds of comics.  It happened to coincide with the independent boom and with the DC Renaissance, where they built on the success of New Teen Titans and Legion of Superheroes, Crisis and Dark Knight and Swamp Thing.  They really built and built, creating a new image and a new vitality.  Marvel, for me, at the time, was more staying the course.  1986 was a real watershed year for everyone, with indie comics starting up left and right (many in response to the TMNT), DC really catching fire, and Marvel in strong overall position.  There was such a wealth of really good material out there and not just superheroes.