Alright. Sorry for double post, but I need to say something.
When you are doing Elven age, take the age he/she would be as a human, and multiply it by ten.
Elves are children for the first 150 years of their lives.
So, if your elf is 300, he is 30. If he is 150, he is 15. If he is 1, then he 0.1
Not according to the good folks at the Lore forum.
There's some dispute, but this is the consensus that I've seen. According to them, elven lifespans are more flexible than humans, but they're not usually that long.
Bosmer and Dunmer tend to live to about 150-200, give or take. Altmer average about 300.
Low-class elves, or elves that have done a lot of hard work all their lives can expect to live to about 120.
2 things are known to extend lifespans: easy lives and magic. I'm not clear on the details, but these things can add a century or two to most lifespans. Telvanni tend to live pretty long, for example. Barenziah, at 500, is exceptional, but not un-heard of, since she has royal blood and has lived the life of a noble. Divath Fyr, at 4000, is downright astonishing, but he's something of an exception.
Lore buffs are free to correct me, but I have seen the sources that the Lore people use, and these ages seem sound.