The time format used on the Pony Index is based on summer suns. Eg: The 1000th summer sun is Nightmare Moon's return. It's not clear what summer sun it is by the time of Twilight's coronation. If the Q&A below is to be believed, it can't be more than a few summer suns after the 1000th summer sun.
It's not ever explicitly stated how old any pony in the show is, but if ponies are like horses, they are an adult at about five years, or summer suns... at least biologically.
This can be a couple things: First, there is a format miss-match between the old Pony Index (where the photo comes from) and the current one, where the pony's name is in text form instead of in the image. Or I may have simply forgotten to update the image.
Currently, it's just me, Peekofwar.
Short answer: No.
You must sleep for about 8 hours a day, eat food at least 2-3 times a day, and you must remember to never go to the boop page.
This question can be interpreted multiple different ways.
Do you even know the context behind in which the above question was raised?
This pony index assumes that the average pony is about four foot, six inches from hoof to head. This is partially because the model scale for PPM/2 is this.
Blu Winglet was my first OC, although technically he was named "Cyan Wing" originally... I believe I must've lost the PPM file, because at some point I remade my OC from scratch which became the Cyan Winglet of today... But then I went back and recreated the original OC renaming him to "Blu Wing" given he was darker in color to Cyan Winglet. And yes, I wasn't originally using PPM/2 which I would later start using after creating most of my characters.