Not like whatever the deal was with Patrik Stefan in the IHL back in the day.
It was pretty crazy, Robert Dome played in the IHL at 16. In the mid-90's, the IHL thought they could compete with the NHL so they probably had more lax rules with age in order to attract more talent. Almost like the USFL in the 80s being an option for players who wanted to leave college early since the NFL wasn't an option.
In that CBA, a European player had to be drafted first before coming into the NHL. So the IHL ended up being a decent paying option for some Europeans to play before going to the NHL.
If only for the walk through memory lane:
1991-92: Dmitri Kvartalnov (25)
1992-93: Mikhail Shtalenkov (28), Igor Chibarev (24)
1993-94: Radek Bonk (17)
1994-95: Petr Sykora (17), Vladimir Tsyplakov (24)
1995-96: Ruslan Salei (20), Konstantin Shafronov (27)
1996-97: Sergei Samsonov (18), Robert Dome (16 when he started in 1995), Sergei Yerkovich (22)
1997-98: Andrei Bashkirov (27), Rastislav Pavlikovsky (20)
1998-99: Patrik Stefan (17), Mikko Kuparinen (21)
Another fun rabbit hole might be established NHLers who briefly played in the IHL during contract disputes. Curtis Joseph, Sean Burke, Nikolai Khabibulin, and Peter Bondra off the top of my head.