All my main characters are Altmers so I imagined them to be older like around 100 years or so. Then I decided my Oblivion character is the daughter of my Arena + Daggerfall characters, so she can't really be more than 30 years old. So yeah, she's around 25. And this now applies to all my TES characters except my Skyrim character (which hasn't been created yet). I want him to be the son of my Morrowind and Oblivion characters, so he could be very old.
PS: I know Skyrim's hero is "Dragonborn", but don't spoil me on how to somehow make that the heir of my existing characters, I'm sure I can find a way when I play it
My Altmer are usually in their 40s, which means that they are young for Altmer but old enough to know about the world.
My human characters are usually much younger than that since I'm 21 myself, it's easier to relate to someone of my age.
20-30. Because, like flying an airplane there is no making up for the runway behind you or the altitude above you. In life, there is no making up the years behind you.
Depends on the character...
What should I vote for, when the age ranges from 20 to 500?
My Skyrim character was the only one I really thought about it with. I started out the game playing as like a 20 something year old but as I kept playing I "got older" and now my character is still active but more of a settled down dad now.
I like the 30-40's range. Suppose its the Age of Knowing in my mind where you are smart enough to figure things out, and young enough to do something about it.
And since I typically play elves, this is a relatively young age.
Most of my characters are 20-30 years or their equivalent for elves. Young enough to still be adventurous, yet old enough to have some experience and having a specialization.
I play exclusively as Dunmer, so we have a very long lifespan.
One is a powerful Mage, so he could theoretically live as long as Divayth Fyr. My other character is an Assassin, but both are also Vampires.
I choose their age to be "unknown" as I have been RP'ing them since Daggerfall. I know I could easily do the math, but I like the whole "ancient and mysterious" aspect to them.