Who was the youngest winner of Gagarin Cup?

Question

Gagarin Cup is the name for KHL playoffs. (KHL is widely considered the second best ice hockey league in the world, after NHL.) In the last season, 20-years old Ilya Sorokin and 19 years old Ilya Samsonov played in the final. This is relatively young age for a goaltender. This made me wonder:

• Who was the youngest winner of Gagarin Cup?
• Who was the youngest goaltender, defenseman, forward to win this trophy?

(This is probably clear from the context, but I mean age at the time of winning the cup.)

Answer 1

I am posting a CW answer, feel free to edit it if there are younger Gagarin cup winners that I was able to find. (Or if you can find further references.)

I have searched among players listed as Gagarin Cup Champions at Elite Prospects.

• Forwards: Kirill Petrov won 2009 Gagarin Cup at the age of 18 years, 11 months, 30 days (one day before his 19th birthday).
• Defencemen: Andrei Mironov won 2013 Gagarin Cup at the age of 18 years, 8 months, 19 days.
• Goaltenders: Ilya Samsonov won 2016 Gagarin Cup at the age of 19 years, 1 months, 28 days.