[kgwgk]

The COVID-19 infection fatality rate in the 18-45 group is at least 0.11% in NYC. And that's assuming that everyone single person has been infected, that no-one else is going to die from now on and that the estimates are not going to be revised upwards because of under-reporting.

The infection fatality rate for seasonal flu [edit: in the slightly older 18-49 group] is around 0.2% considering symptomatic cases, and probably there are as many asymptomatic cases which give 0.1%.

So yes, it's not impossible for the infection fatality rate to be similar. With some strong assumptions including that it's five times as contagious. So yes, it's not impossible for the acumulated lethality over five years to be similar. And if you extend the period the common flu will be much more dangerous, specially as this young people became older.