Russia's age of consent is 16 (for sex and marriage to clarify) Driving a car is another story, it affects life and safety of others (other drivers, pedestrians, passengers in cars and of the driver). Having sex or marrying - affects only these two.
Most of Europe has age of consent 16-17. In Canada - 16. In USA by state - 16-18. In Italy it is 14. Many other countries vary between 13-14-15. It is a fact.
worldpopulationreview.com
Now the issue of which law to apply, USA's or Russia's. If we are to use Russian law (hypothetically) as it is at 16, then Elena is one year above the age of consent, IF in fact they started an affair when she was 17 (that is to be disputed below). But gazillion of times, specifically on FSU, to my previous comments about the Russian laws, i'be been scolded that it's the local current residence determines the law, so i must use USA where Morozov usually spends time in USA.
Well darling, don't choke - The New Jersey Age of Consent is 16 years old.
www.ageofconsent.net
But Elena and Morozov did not start an affair when she was 17. She was 17 in 2011. The team transferred to Morozov in the 2nd half of 2011. Elena/Nikita were lovers then and continued to be lovers into early 2013. Then they were having disagreements for a short while, and then Elena started giving winks to Morozov and then the affair. She was already 20 then, or even if 19, either way she and Morozov were not illegal by laws of many lands......
ru.wikipedia.org
... было, помимо прочих преимуществ, просто и удобно общаться: несмотря на двукратную разницу в возрасте (Ильиных в 2014 году было 20 лет, Морозову — 39)
.. besides various conveniences in other activities (as a coach and skater) found it easy and convenient to communicate, besides the almost 2x age difference (she was 20, he was 39).