Here is a guideline for how old you can make your character:
Generally speaking most characters are going to be under 100 years old as a vampire.
If you would like to be older than that, you will need to work with Staff and submit a background before debuting a character.
With a submitted background characters should be no more than 300 years active. If you want to play someone from the 14 century - no problem. Just have a long time in torpor in your backstory.
Of course you should have generation that makes sense as well. If you are going to be older than 150 years, you really should have 2 dots in Generation.
Remember, for sense of scale: Francois Villon, Prince of Paris is considered to be one of the eldest Princes in all of the Camarilla. He was embraced in 1230.
Finally, with a convincing background, there are exceptions to these guidelines - but they are made at Staff discretion.
Let me tell you a story....