Are you sure? Russia draft from when they are 18, and it’s claimed many at the front have less than 6 months training.
Teenager = 13-19 years.
Even if Russia send most young soldiers to non combat areas, I seriously doubt that the priority is the safety of the soldiers, considering the meat wave tactics they use, and the fact that they keep pushing despite horrendous losses.
Well if Putin says so it must be true. /s
Or rather Putin is a notorious liar, and a narcissist, meaning his lies have a specific purpose, and that is to put himself in better light.