Anyone to explain me age rules of AHL? Are there any quotas?
As example I will point out VHL (minors in Russia) rules. Club has to have at least 5 players under 23 year, minimum of 5 players under 25 years and one under 20 and 21 years. Does AHL have something like that? You can play VHL if you are 17 and older
The minimum age to play in the AHL is 18 (as of September 15th for the current season). There is an agreement in place between the NHL and CHL that prohibits players from Juniors from being assigned to AHL clubs until they turn 20, although there are a few exemptions.
Of the 18 skaters a team uses 12 must have played 260 or less pro games (AHL, NHL, the old IHL, and Euro elite leagues) and one must have played 320 or less pro games.
Near the top you'll see a listing of categories. Under the one names "the AHL", the last 3 options (Rules, guide & record book, and FAQ's ) are what you're looking for.
One exemption that 210 alluded to is that a player whose junior or college season is completed (including all playoffs) can be signed to an Amateur Tryout contract to play for an AHL team at the end of their season.
Also note his use of words - "prohibits players from juniors". Undrafted European or Russian players can play in the "A" at 18.