The original claim was that lowered life expectancy was due to drug overdoses. Drug overdoses account for only 3% of all deaths. How much does the fact that 62% of them were under 44 move the needle?
In 2020, life expectancy was 77 years; an increase of 1% of the total number (before the increase) of deaths occurring at 44 (33 years below expectancy reduces life expectancy by 0.327-ish years on its own.
Again, only 3% of all deaths are from overdoses. If you assume that all of them lived to 77 instead of 44, that would make a difference of about 1 year in total life expectancy.